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Ignore whitespace Rev 1786 → Rev 1787

/trunk/kernel/generic/src/console/console.c
0,0 → 1,170
/*
* Copyright (C) 2003 Josef Cejka
* Copyright (C) 2005 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
 
/** @addtogroup genericconsole
* @{
*/
/** @file
*/
 
#include <console/console.h>
#include <console/chardev.h>
#include <synch/waitq.h>
#include <synch/spinlock.h>
#include <arch/types.h>
#include <typedefs.h>
#include <arch.h>
#include <func.h>
#include <print.h>
#include <atomic.h>
 
#define BUFLEN 2048
static char debug_buffer[BUFLEN];
static size_t offset = 0;
/** Initialize stdout to something that does not print, but does not fail
*
* Save data in some buffer so that it could be retrieved in the debugger
*/
static void null_putchar(chardev_t *d, const char ch)
{
if (offset >= BUFLEN)
offset = 0;
debug_buffer[offset++] = ch;
}
 
static chardev_operations_t null_stdout_ops = {
.write = null_putchar
};
chardev_t null_stdout = {
.name = "null",
.op = &null_stdout_ops
};
 
/** Standard input character device. */
chardev_t *stdin = NULL;
chardev_t *stdout = &null_stdout;
 
/** Get character from character device. Do not echo character.
*
* @param chardev Character device.
*
* @return Character read.
*/
uint8_t _getc(chardev_t *chardev)
{
uint8_t ch;
ipl_t ipl;
 
if (atomic_get(&haltstate)) {
/* If we are here, we are hopefully on the processor, that
* issued the 'halt' command, so proceed to read the character
* directly from input
*/
if (chardev->op->read)
return chardev->op->read(chardev);
/* no other way of interacting with user, halt */
if (CPU)
printf("cpu%d: ", CPU->id);
else
printf("cpu: ");
printf("halted - no kconsole\n");
cpu_halt();
}
 
waitq_sleep(&chardev->wq);
ipl = interrupts_disable();
spinlock_lock(&chardev->lock);
ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN];
chardev->counter--;
spinlock_unlock(&chardev->lock);
interrupts_restore(ipl);
 
chardev->op->resume(chardev);
 
return ch;
}
 
/** Get string from character device.
*
* Read characters from character device until first occurrence
* of newline character.
*
* @param chardev Character device.
* @param buf Buffer where to store string terminated by '\0'.
* @param buflen Size of the buffer.
*
* @return Number of characters read.
*/
count_t gets(chardev_t *chardev, char *buf, size_t buflen)
{
index_t index = 0;
char ch;
 
while (index < buflen) {
ch = _getc(chardev);
if (ch == '\b') {
if (index > 0) {
index--;
/* Space backspace, space */
putchar('\b');
putchar(' ');
putchar('\b');
}
continue;
}
putchar(ch);
 
if (ch == '\n') { /* end of string => write 0, return */
buf[index] = '\0';
return (count_t) index;
}
buf[index++] = ch;
}
return (count_t) index;
}
 
/** Get character from device & echo it to screen */
uint8_t getc(chardev_t *chardev)
{
uint8_t ch;
 
ch = _getc(chardev);
putchar(ch);
return ch;
}
 
void putchar(char c)
{
if (stdout->op->write)
stdout->op->write(stdout, c);
}
 
/** @}
*/
 
/trunk/kernel/generic/src/console/cmd.c
0,0 → 1,811
/*
* Copyright (C) 2005 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
 
/** @addtogroup genericconsole
* @{
*/
 
/**
* @file cmd.c
* @brief Kernel console command wrappers.
*
* This file is meant to contain all wrapper functions for
* all kconsole commands. The point is in separating
* kconsole specific wrappers from kconsole-unaware functions
* from other subsystems.
*/
 
#include <console/cmd.h>
#include <console/console.h>
#include <console/kconsole.h>
#include <print.h>
#include <panic.h>
#include <typedefs.h>
#include <arch/types.h>
#include <adt/list.h>
#include <arch.h>
#include <func.h>
#include <macros.h>
#include <debug.h>
#include <symtab.h>
#include <cpu.h>
#include <mm/tlb.h>
#include <arch/mm/tlb.h>
#include <mm/frame.h>
#include <main/version.h>
#include <mm/slab.h>
#include <proc/scheduler.h>
#include <proc/thread.h>
#include <proc/task.h>
#include <ipc/ipc.h>
#include <ipc/irq.h>
 
/* Data and methods for 'help' command. */
static int cmd_help(cmd_arg_t *argv);
static cmd_info_t help_info = {
.name = "help",
.description = "List of supported commands.",
.func = cmd_help,
.argc = 0
};
 
static cmd_info_t exit_info = {
.name = "exit",
.description ="Exit kconsole",
.argc = 0
};
 
static int cmd_continue(cmd_arg_t *argv);
static cmd_info_t continue_info = {
.name = "continue",
.description ="Return console back to userspace.",
.func = cmd_continue,
.argc = 0
};
 
/* Data and methods for 'description' command. */
static int cmd_desc(cmd_arg_t *argv);
static void desc_help(void);
static char desc_buf[MAX_CMDLINE+1];
static cmd_arg_t desc_argv = {
.type = ARG_TYPE_STRING,
.buffer = desc_buf,
.len = sizeof(desc_buf)
};
static cmd_info_t desc_info = {
.name = "describe",
.description = "Describe specified command.",
.help = desc_help,
.func = cmd_desc,
.argc = 1,
.argv = &desc_argv
};
 
/* Data and methods for 'symaddr' command. */
static int cmd_symaddr(cmd_arg_t *argv);
static char symaddr_buf[MAX_CMDLINE+1];
static cmd_arg_t symaddr_argv = {
.type = ARG_TYPE_STRING,
.buffer = symaddr_buf,
.len = sizeof(symaddr_buf)
};
static cmd_info_t symaddr_info = {
.name = "symaddr",
.description = "Return symbol address.",
.func = cmd_symaddr,
.argc = 1,
.argv = &symaddr_argv
};
 
static char set_buf[MAX_CMDLINE+1];
static int cmd_set4(cmd_arg_t *argv);
static cmd_arg_t set4_argv[] = {
{
.type = ARG_TYPE_STRING,
.buffer = set_buf,
.len = sizeof(set_buf)
},
{
.type = ARG_TYPE_INT
}
};
static cmd_info_t set4_info = {
.name = "set4",
.description = "set <dest_addr> <value> - 4byte version",
.func = cmd_set4,
.argc = 2,
.argv = set4_argv
};
 
/* Data and methods for 'call0' command. */
static char call0_buf[MAX_CMDLINE+1];
static char carg1_buf[MAX_CMDLINE+1];
static char carg2_buf[MAX_CMDLINE+1];
static char carg3_buf[MAX_CMDLINE+1];
 
static int cmd_call0(cmd_arg_t *argv);
static cmd_arg_t call0_argv = {
.type = ARG_TYPE_STRING,
.buffer = call0_buf,
.len = sizeof(call0_buf)
};
static cmd_info_t call0_info = {
.name = "call0",
.description = "call0 <function> -> call function().",
.func = cmd_call0,
.argc = 1,
.argv = &call0_argv
};
 
/* Data and methods for 'call1' command. */
static int cmd_call1(cmd_arg_t *argv);
static cmd_arg_t call1_argv[] = {
{
.type = ARG_TYPE_STRING,
.buffer = call0_buf,
.len = sizeof(call0_buf)
},
{
.type = ARG_TYPE_VAR,
.buffer = carg1_buf,
.len = sizeof(carg1_buf)
}
};
static cmd_info_t call1_info = {
.name = "call1",
.description = "call1 <function> <arg1> -> call function(arg1).",
.func = cmd_call1,
.argc = 2,
.argv = call1_argv
};
 
/* Data and methods for 'call2' command. */
static int cmd_call2(cmd_arg_t *argv);
static cmd_arg_t call2_argv[] = {
{
.type = ARG_TYPE_STRING,
.buffer = call0_buf,
.len = sizeof(call0_buf)
},
{
.type = ARG_TYPE_VAR,
.buffer = carg1_buf,
.len = sizeof(carg1_buf)
},
{
.type = ARG_TYPE_VAR,
.buffer = carg2_buf,
.len = sizeof(carg2_buf)
}
};
static cmd_info_t call2_info = {
.name = "call2",
.description = "call2 <function> <arg1> <arg2> -> call function(arg1,arg2).",
.func = cmd_call2,
.argc = 3,
.argv = call2_argv
};
 
/* Data and methods for 'call3' command. */
static int cmd_call3(cmd_arg_t *argv);
static cmd_arg_t call3_argv[] = {
{
.type = ARG_TYPE_STRING,
.buffer = call0_buf,
.len = sizeof(call0_buf)
},
{
.type = ARG_TYPE_VAR,
.buffer = carg1_buf,
.len = sizeof(carg1_buf)
},
{
.type = ARG_TYPE_VAR,
.buffer = carg2_buf,
.len = sizeof(carg2_buf)
},
{
.type = ARG_TYPE_VAR,
.buffer = carg3_buf,
.len = sizeof(carg3_buf)
}
 
};
static cmd_info_t call3_info = {
.name = "call3",
.description = "call3 <function> <arg1> <arg2> <arg3> -> call function(arg1,arg2,arg3).",
.func = cmd_call3,
.argc = 4,
.argv = call3_argv
};
 
/* Data and methods for 'halt' command. */
static int cmd_halt(cmd_arg_t *argv);
static cmd_info_t halt_info = {
.name = "halt",
.description = "Halt the kernel.",
.func = cmd_halt,
.argc = 0
};
 
/* Data and methods for 'tlb' command. */
static int cmd_tlb(cmd_arg_t *argv);
cmd_info_t tlb_info = {
.name = "tlb",
.description = "Print TLB of current processor.",
.help = NULL,
.func = cmd_tlb,
.argc = 0,
.argv = NULL
};
 
static int cmd_threads(cmd_arg_t *argv);
static cmd_info_t threads_info = {
.name = "threads",
.description = "List all threads.",
.func = cmd_threads,
.argc = 0
};
 
static int cmd_tasks(cmd_arg_t *argv);
static cmd_info_t tasks_info = {
.name = "tasks",
.description = "List all tasks.",
.func = cmd_tasks,
.argc = 0
};
 
 
static int cmd_sched(cmd_arg_t *argv);
static cmd_info_t sched_info = {
.name = "scheduler",
.description = "List all scheduler information.",
.func = cmd_sched,
.argc = 0
};
 
static int cmd_slabs(cmd_arg_t *argv);
static cmd_info_t slabs_info = {
.name = "slabs",
.description = "List slab caches.",
.func = cmd_slabs,
.argc = 0
};
 
/* Data and methods for 'zones' command */
static int cmd_zones(cmd_arg_t *argv);
static cmd_info_t zones_info = {
.name = "zones",
.description = "List of memory zones.",
.func = cmd_zones,
.argc = 0
};
 
/* Data and methods for 'ipc_task' command */
static int cmd_ipc_task(cmd_arg_t *argv);
static cmd_arg_t ipc_task_argv = {
.type = ARG_TYPE_INT,
};
static cmd_info_t ipc_task_info = {
.name = "ipc_task",
.description = "ipc_task <taskid> Show IPC information of given task.",
.func = cmd_ipc_task,
.argc = 1,
.argv = &ipc_task_argv
};
 
/* Data and methods for 'zone' command */
static int cmd_zone(cmd_arg_t *argv);
static cmd_arg_t zone_argv = {
.type = ARG_TYPE_INT,
};
 
static cmd_info_t zone_info = {
.name = "zone",
.description = "Show memory zone structure.",
.func = cmd_zone,
.argc = 1,
.argv = &zone_argv
};
 
/* Data and methods for 'cpus' command. */
static int cmd_cpus(cmd_arg_t *argv);
cmd_info_t cpus_info = {
.name = "cpus",
.description = "List all processors.",
.help = NULL,
.func = cmd_cpus,
.argc = 0,
.argv = NULL
};
 
/* Data and methods for 'version' command. */
static int cmd_version(cmd_arg_t *argv);
cmd_info_t version_info = {
.name = "version",
.description = "Print version information.",
.help = NULL,
.func = cmd_version,
.argc = 0,
.argv = NULL
};
 
static cmd_info_t *basic_commands[] = {
&call0_info,
&call1_info,
&call2_info,
&call3_info,
&continue_info,
&cpus_info,
&desc_info,
&exit_info,
&halt_info,
&help_info,
&ipc_task_info,
&set4_info,
&slabs_info,
&symaddr_info,
&sched_info,
&threads_info,
&tasks_info,
&tlb_info,
&version_info,
&zones_info,
&zone_info,
NULL
};
 
 
/** Initialize command info structure.
*
* @param cmd Command info structure.
*
*/
void cmd_initialize(cmd_info_t *cmd)
{
spinlock_initialize(&cmd->lock, "cmd");
link_initialize(&cmd->link);
}
 
/** Initialize and register commands. */
void cmd_init(void)
{
int i;
 
for (i=0;basic_commands[i]; i++) {
cmd_initialize(basic_commands[i]);
if (!cmd_register(basic_commands[i]))
panic("could not register command %s\n",
basic_commands[i]->name);
}
}
 
 
/** List supported commands.
*
* @param argv Argument vector.
*
* @return 0 on failure, 1 on success.
*/
int cmd_help(cmd_arg_t *argv)
{
link_t *cur;
 
spinlock_lock(&cmd_lock);
for (cur = cmd_head.next; cur != &cmd_head; cur = cur->next) {
cmd_info_t *hlp;
hlp = list_get_instance(cur, cmd_info_t, link);
spinlock_lock(&hlp->lock);
printf("%s - %s\n", hlp->name, hlp->description);
 
spinlock_unlock(&hlp->lock);
}
spinlock_unlock(&cmd_lock);
 
return 1;
}
 
/** Describe specified command.
*
* @param argv Argument vector.
*
* @return 0 on failure, 1 on success.
*/
int cmd_desc(cmd_arg_t *argv)
{
link_t *cur;
 
spinlock_lock(&cmd_lock);
for (cur = cmd_head.next; cur != &cmd_head; cur = cur->next) {
cmd_info_t *hlp;
hlp = list_get_instance(cur, cmd_info_t, link);
spinlock_lock(&hlp->lock);
 
if (strncmp(hlp->name, (const char *) argv->buffer, strlen(hlp->name)) == 0) {
printf("%s - %s\n", hlp->name, hlp->description);
if (hlp->help)
hlp->help();
spinlock_unlock(&hlp->lock);
break;
}
 
spinlock_unlock(&hlp->lock);
}
spinlock_unlock(&cmd_lock);
 
return 1;
}
 
/** Search symbol table */
int cmd_symaddr(cmd_arg_t *argv)
{
symtab_print_search(argv->buffer);
return 1;
}
 
/** Call function with zero parameters */
int cmd_call0(cmd_arg_t *argv)
{
uintptr_t symaddr;
char *symbol;
unative_t (*f)(void);
#ifdef ia64
struct {
unative_t f;
unative_t gp;
}fptr;
#endif
 
symaddr = get_symbol_addr(argv->buffer);
if (!symaddr)
printf("Symbol %s not found.\n", argv->buffer);
else if (symaddr == (uintptr_t) -1) {
symtab_print_search(argv->buffer);
printf("Duplicate symbol, be more specific.\n");
} else {
symbol = get_symtab_entry(symaddr);
printf("Calling f(): %.*p: %s\n", sizeof(uintptr_t) * 2, symaddr, symbol);
#ifdef ia64
fptr.f = symaddr;
fptr.gp = ((unative_t *)cmd_call2)[1];
f = (unative_t (*)(void)) &fptr;
#else
f = (unative_t (*)(void)) symaddr;
#endif
printf("Result: %#zx\n", f());
}
return 1;
}
 
/** Call function with one parameter */
int cmd_call1(cmd_arg_t *argv)
{
uintptr_t symaddr;
char *symbol;
unative_t (*f)(unative_t,...);
unative_t arg1 = argv[1].intval;
#ifdef ia64
struct {
unative_t f;
unative_t gp;
}fptr;
#endif
 
symaddr = get_symbol_addr(argv->buffer);
if (!symaddr)
printf("Symbol %s not found.\n", argv->buffer);
else if (symaddr == (uintptr_t) -1) {
symtab_print_search(argv->buffer);
printf("Duplicate symbol, be more specific.\n");
} else {
symbol = get_symtab_entry(symaddr);
 
printf("Calling f(%#zx): %.*p: %s\n", arg1, sizeof(uintptr_t) * 2, symaddr, symbol);
#ifdef ia64
fptr.f = symaddr;
fptr.gp = ((unative_t *)cmd_call2)[1];
f = (unative_t (*)(unative_t,...)) &fptr;
#else
f = (unative_t (*)(unative_t,...)) symaddr;
#endif
printf("Result: %#zx\n", f(arg1));
}
return 1;
}
 
/** Call function with two parameters */
int cmd_call2(cmd_arg_t *argv)
{
uintptr_t symaddr;
char *symbol;
unative_t (*f)(unative_t,unative_t,...);
unative_t arg1 = argv[1].intval;
unative_t arg2 = argv[2].intval;
#ifdef ia64
struct {
unative_t f;
unative_t gp;
}fptr;
#endif
 
symaddr = get_symbol_addr(argv->buffer);
if (!symaddr)
printf("Symbol %s not found.\n", argv->buffer);
else if (symaddr == (uintptr_t) -1) {
symtab_print_search(argv->buffer);
printf("Duplicate symbol, be more specific.\n");
} else {
symbol = get_symtab_entry(symaddr);
printf("Calling f(0x%zx,0x%zx): %.*p: %s\n",
arg1, arg2, sizeof(uintptr_t) * 2, symaddr, symbol);
#ifdef ia64
fptr.f = symaddr;
fptr.gp = ((unative_t *)cmd_call2)[1];
f = (unative_t (*)(unative_t,unative_t,...)) &fptr;
#else
f = (unative_t (*)(unative_t,unative_t,...)) symaddr;
#endif
printf("Result: %#zx\n", f(arg1, arg2));
}
return 1;
}
 
/** Call function with three parameters */
int cmd_call3(cmd_arg_t *argv)
{
uintptr_t symaddr;
char *symbol;
unative_t (*f)(unative_t,unative_t,unative_t,...);
unative_t arg1 = argv[1].intval;
unative_t arg2 = argv[2].intval;
unative_t arg3 = argv[3].intval;
#ifdef ia64
struct {
unative_t f;
unative_t gp;
}fptr;
#endif
 
symaddr = get_symbol_addr(argv->buffer);
if (!symaddr)
printf("Symbol %s not found.\n", argv->buffer);
else if (symaddr == (uintptr_t) -1) {
symtab_print_search(argv->buffer);
printf("Duplicate symbol, be more specific.\n");
} else {
symbol = get_symtab_entry(symaddr);
printf("Calling f(0x%zx,0x%zx, 0x%zx): %.*p: %s\n",
arg1, arg2, arg3, sizeof(uintptr_t) * 2, symaddr, symbol);
#ifdef ia64
fptr.f = symaddr;
fptr.gp = ((unative_t *)cmd_call2)[1];
f = (unative_t (*)(unative_t,unative_t,unative_t,...)) &fptr;
#else
f = (unative_t (*)(unative_t,unative_t,unative_t,...)) symaddr;
#endif
printf("Result: %#zx\n", f(arg1, arg2, arg3));
}
return 1;
}
 
 
/** Print detailed description of 'describe' command. */
void desc_help(void)
{
printf("Syntax: describe command_name\n");
}
 
/** Halt the kernel.
*
* @param argv Argument vector (ignored).
*
* @return 0 on failure, 1 on success (never returns).
*/
int cmd_halt(cmd_arg_t *argv)
{
halt();
return 1;
}
 
/** Command for printing TLB contents.
*
* @param argv Not used.
*
* @return Always returns 1.
*/
int cmd_tlb(cmd_arg_t *argv)
{
tlb_print();
return 1;
}
 
/** Write 4 byte value to address */
int cmd_set4(cmd_arg_t *argv)
{
uint32_t *addr ;
uint32_t arg1 = argv[1].intval;
bool pointer = false;
 
if (((char *)argv->buffer)[0] == '*') {
addr = (uint32_t *) get_symbol_addr(argv->buffer+1);
pointer = true;
} else if (((char *)argv->buffer)[0] >= '0' &&
((char *)argv->buffer)[0] <= '9')
addr = (uint32_t *)atoi((char *)argv->buffer);
else
addr = (uint32_t *)get_symbol_addr(argv->buffer);
 
if (!addr)
printf("Symbol %s not found.\n", argv->buffer);
else if (addr == (uint32_t *) -1) {
symtab_print_search(argv->buffer);
printf("Duplicate symbol, be more specific.\n");
} else {
if (pointer)
addr = (uint32_t *)(*(unative_t *)addr);
printf("Writing 0x%x -> %.*p\n", arg1, sizeof(uintptr_t) * 2, addr);
*addr = arg1;
}
return 1;
}
 
/** Command for listings SLAB caches
*
* @param argv Ignores
*
* @return Always 1
*/
int cmd_slabs(cmd_arg_t * argv) {
slab_print_list();
return 1;
}
 
 
/** Command for listings Thread information
*
* @param argv Ignores
*
* @return Always 1
*/
int cmd_threads(cmd_arg_t * argv) {
thread_print_list();
return 1;
}
 
/** Command for listings Task information
*
* @param argv Ignores
*
* @return Always 1
*/
int cmd_tasks(cmd_arg_t * argv) {
task_print_list();
return 1;
}
 
/** Command for listings Thread information
*
* @param argv Ignores
*
* @return Always 1
*/
int cmd_sched(cmd_arg_t * argv) {
sched_print_list();
return 1;
}
 
/** Command for listing memory zones
*
* @param argv Ignored
*
* return Always 1
*/
int cmd_zones(cmd_arg_t * argv) {
zone_print_list();
return 1;
}
 
/** Command for memory zone details
*
* @param argv Integer argument from cmdline expected
*
* return Always 1
*/
int cmd_zone(cmd_arg_t * argv) {
zone_print_one(argv[0].intval);
return 1;
}
 
/** Command for printing task ipc details
*
* @param argv Integer argument from cmdline expected
*
* return Always 1
*/
int cmd_ipc_task(cmd_arg_t * argv) {
ipc_print_task(argv[0].intval);
return 1;
}
 
 
/** Command for listing processors.
*
* @param argv Ignored.
*
* return Always 1.
*/
int cmd_cpus(cmd_arg_t *argv)
{
cpu_list();
return 1;
}
 
/** Command for printing kernel version.
*
* @param argv Ignored.
*
* return Always 1.
*/
int cmd_version(cmd_arg_t *argv)
{
version_print();
return 1;
}
 
/** Command for returning console back to userspace.
*
* @param argv Ignored.
*
* return Always 1.
*/
int cmd_continue(cmd_arg_t *argv)
{
printf("The kernel will now relinquish the console.\n");
printf("Use userspace controls to redraw the screen.\n");
arch_release_console();
ipc_irq_send_msg(IPC_IRQ_KBDRESTART, 0, 0, 0);
return 1;
}
 
/** @}
*/
 
/trunk/kernel/generic/src/console/chardev.c
0,0 → 1,79
/*
* Copyright (C) 2005 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
 
/** @addtogroup genericconsole
* @{
*/
/** @file
*/
 
#include <console/chardev.h>
#include <putchar.h>
#include <synch/waitq.h>
#include <synch/spinlock.h>
 
/** Initialize character device.
*
* @param chardev Character device.
* @param op Implementation of character device operations.
*/
void chardev_initialize(char *name,chardev_t *chardev,
chardev_operations_t *op)
{
chardev->name = name;
 
waitq_initialize(&chardev->wq);
spinlock_initialize(&chardev->lock, "chardev");
chardev->counter = 0;
chardev->index = 0;
chardev->op = op;
}
 
/** Push character read from input character device.
*
* @param chardev Character device.
* @param ch Character being pushed.
*/
void chardev_push_character(chardev_t *chardev, uint8_t ch)
{
spinlock_lock(&chardev->lock);
chardev->counter++;
if (chardev->counter == CHARDEV_BUFLEN - 1) {
/* buffer full => disable device interrupt */
chardev->op->suspend(chardev);
}
chardev->buffer[chardev->index++] = ch;
chardev->index = chardev->index % CHARDEV_BUFLEN; /* index modulo size of buffer */
waitq_wakeup(&chardev->wq, WAKEUP_FIRST);
spinlock_unlock(&chardev->lock);
}
 
/** @}
*/
 
/trunk/kernel/generic/src/console/klog.c
0,0 → 1,110
/*
* Copyright (C) 2006 Ondrej Palkovsky
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
 
/** @addtogroup genericklog
* @{
*/
/** @file
*/
 
#include <mm/frame.h>
#include <sysinfo/sysinfo.h>
#include <console/klog.h>
#include <print.h>
#include <ipc/irq.h>
 
/* Order of frame to be allocated for klog communication */
#define KLOG_ORDER 0
 
static char *klog;
static int klogsize;
static int klogpos;
 
SPINLOCK_INITIALIZE(klog_lock);
 
/** Initialize kernel logging facility
*
* Allocate pages that are to be shared with uspace for console data.
* The shared area is a circular buffer. Userspace application may
* be notified on new data with indication of position and size
* of the data within the circular buffer.
*/
void klog_init(void)
{
void *faddr;
 
faddr = frame_alloc(KLOG_ORDER, FRAME_ATOMIC);
if (!faddr)
panic("Cannot allocate page for klog");
klog = (char *)PA2KA(faddr);
sysinfo_set_item_val("klog.faddr", NULL, (unative_t)faddr);
sysinfo_set_item_val("klog.pages", NULL, 1 << KLOG_ORDER);
 
klogsize = PAGE_SIZE << KLOG_ORDER;
klogpos = 0;
}
 
static void klog_vprintf(const char *fmt, va_list args)
{
int ret;
va_list atst;
 
va_copy(atst, args);
spinlock_lock(&klog_lock);
 
ret = vsnprintf(klog+klogpos, klogsize-klogpos, fmt, atst);
if (ret >= klogsize-klogpos) {
klogpos = 0;
if (ret >= klogsize)
goto out;
}
ipc_irq_send_msg(IPC_IRQ_KLOG, klogpos, ret, 0);
klogpos += ret;
if (klogpos >= klogsize)
klogpos = 0;
out:
spinlock_unlock(&klog_lock);
va_end(atst);
}
 
/** Printf a message to kernel-uspace log */
void klog_printf(const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
klog_vprintf(fmt, args);
 
va_end(args);
}
 
/** @}
*/
 
/trunk/kernel/generic/src/console/kconsole.c
0,0 → 1,631
/*
* Copyright (C) 2005 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
 
/** @addtogroup genericconsole
* @{
*/
 
/**
* @file kconsole.c
* @brief Kernel console.
*
* This file contains kernel thread managing the kernel console.
*/
 
#include <console/kconsole.h>
#include <console/console.h>
#include <console/chardev.h>
#include <console/cmd.h>
#include <print.h>
#include <panic.h>
#include <typedefs.h>
#include <arch/types.h>
#include <adt/list.h>
#include <arch.h>
#include <macros.h>
#include <debug.h>
#include <func.h>
#include <symtab.h>
#include <macros.h>
 
/** Simple kernel console.
*
* The console is realized by kernel thread kconsole.
* It doesn't understand any useful command on its own,
* but makes it possible for other kernel subsystems to
* register their own commands.
*/
/** Locking.
*
* There is a list of cmd_info_t structures. This list
* is protected by cmd_lock spinlock. Note that specially
* the link elements of cmd_info_t are protected by
* this lock.
*
* Each cmd_info_t also has its own lock, which protects
* all elements thereof except the link element.
*
* cmd_lock must be acquired before any cmd_info lock.
* When locking two cmd info structures, structure with
* lower address must be locked first.
*/
SPINLOCK_INITIALIZE(cmd_lock); /**< Lock protecting command list. */
LIST_INITIALIZE(cmd_head); /**< Command list. */
 
static cmd_info_t *parse_cmdline(char *cmdline, size_t len);
static bool parse_argument(char *cmdline, size_t len, index_t *start, index_t *end);
static char history[KCONSOLE_HISTORY][MAX_CMDLINE] = {};
 
/** Initialize kconsole data structures. */
void kconsole_init(void)
{
int i;
 
cmd_init();
for (i=0; i<KCONSOLE_HISTORY; i++)
history[i][0] = '\0';
}
 
 
/** Register kconsole command.
*
* @param cmd Structure describing the command.
*
* @return 0 on failure, 1 on success.
*/
int cmd_register(cmd_info_t *cmd)
{
link_t *cur;
spinlock_lock(&cmd_lock);
/*
* Make sure the command is not already listed.
*/
for (cur = cmd_head.next; cur != &cmd_head; cur = cur->next) {
cmd_info_t *hlp;
hlp = list_get_instance(cur, cmd_info_t, link);
 
if (hlp == cmd) {
/* The command is already there. */
spinlock_unlock(&cmd_lock);
return 0;
}
 
/* Avoid deadlock. */
if (hlp < cmd) {
spinlock_lock(&hlp->lock);
spinlock_lock(&cmd->lock);
} else {
spinlock_lock(&cmd->lock);
spinlock_lock(&hlp->lock);
}
if ((strncmp(hlp->name,
cmd->name, max(strlen(cmd->name),
strlen(hlp->name))) == 0)) {
/* The command is already there. */
spinlock_unlock(&hlp->lock);
spinlock_unlock(&cmd->lock);
spinlock_unlock(&cmd_lock);
return 0;
}
spinlock_unlock(&hlp->lock);
spinlock_unlock(&cmd->lock);
}
/*
* Now the command can be added.
*/
list_append(&cmd->link, &cmd_head);
spinlock_unlock(&cmd_lock);
return 1;
}
 
/** Print count times a character */
static void rdln_print_c(char ch, int count)
{
int i;
for (i=0;i<count;i++)
putchar(ch);
}
 
/** Insert character to string */
static void insert_char(char *str, char ch, int pos)
{
int i;
for (i=strlen(str);i > pos; i--)
str[i] = str[i-1];
str[pos] = ch;
}
 
/** Try to find a command beginning with prefix */
static const char * cmdtab_search_one(const char *name,link_t **startpos)
{
int namelen = strlen(name);
const char *curname;
 
spinlock_lock(&cmd_lock);
 
if (!*startpos)
*startpos = cmd_head.next;
 
for (;*startpos != &cmd_head;*startpos = (*startpos)->next) {
cmd_info_t *hlp;
hlp = list_get_instance(*startpos, cmd_info_t, link);
 
curname = hlp->name;
if (strlen(curname) < namelen)
continue;
if (strncmp(curname, name, namelen) == 0) {
spinlock_unlock(&cmd_lock);
return curname+namelen;
}
}
spinlock_unlock(&cmd_lock);
return NULL;
}
 
 
/** Command completion of the commands
*
* @param name - string to match, changed to hint on exit
* @return number of found matches
*/
static int cmdtab_compl(char *name)
{
char output[MAX_SYMBOL_NAME+1];
link_t *startpos = NULL;
const char *foundtxt;
int found = 0;
int i;
 
output[0] = '\0';
while ((foundtxt = cmdtab_search_one(name, &startpos))) {
startpos = startpos->next;
if (!found)
strncpy(output, foundtxt, strlen(foundtxt)+1);
else {
for (i=0; output[i] && foundtxt[i] && output[i]==foundtxt[i]; i++)
;
output[i] = '\0';
}
found++;
}
if (!found)
return 0;
 
if (found > 1 && !strlen(output)) {
printf("\n");
startpos = NULL;
while ((foundtxt = cmdtab_search_one(name, &startpos))) {
cmd_info_t *hlp;
hlp = list_get_instance(startpos, cmd_info_t, link);
printf("%s - %s\n", hlp->name, hlp->description);
startpos = startpos->next;
}
}
strncpy(name, output, MAX_SYMBOL_NAME);
return found;
}
 
static char * clever_readline(const char *prompt, chardev_t *input)
{
static int histposition = 0;
 
char tmp[MAX_CMDLINE+1];
int curlen = 0, position = 0;
char *current = history[histposition];
int i;
char mod; /* Command Modifier */
char c;
 
printf("%s> ", prompt);
while (1) {
c = _getc(input);
if (c == '\n') {
putchar(c);
break;
} if (c == '\b') { /* Backspace */
if (position == 0)
continue;
for (i=position; i<curlen;i++)
current[i-1] = current[i];
curlen--;
position--;
putchar('\b');
for (i=position;i<curlen;i++)
putchar(current[i]);
putchar(' ');
rdln_print_c('\b',curlen-position+1);
continue;
}
if (c == '\t') { /* Tabulator */
int found;
 
/* Move to the end of the word */
for (;position<curlen && current[position]!=' ';position++)
putchar(current[position]);
/* Copy to tmp last word */
for (i=position-1;i >= 0 && current[i]!=' ' ;i--)
;
/* If word begins with * or &, skip it */
if (tmp[0] == '*' || tmp[0] == '&')
for (i=1;tmp[i];i++)
tmp[i-1] = tmp[i];
i++; /* I is at the start of the word */
strncpy(tmp, current+i, position-i+1);
 
if (i==0) { /* Command completion */
found = cmdtab_compl(tmp);
} else { /* Symtab completion */
found = symtab_compl(tmp);
}
 
if (found == 0)
continue;
for (i=0;tmp[i] && curlen < MAX_CMDLINE;i++,curlen++)
insert_char(current, tmp[i], i+position);
 
if (strlen(tmp) || found==1) { /* If we have a hint */
for (i=position;i<curlen;i++)
putchar(current[i]);
position += strlen(tmp);
/* Add space to end */
if (found == 1 && position == curlen && \
curlen < MAX_CMDLINE) {
current[position] = ' ';
curlen++;
position++;
putchar(' ');
}
} else { /* No hint, table was printed */
printf("%s> ", prompt);
for (i=0; i<curlen;i++)
putchar(current[i]);
position += strlen(tmp);
}
rdln_print_c('\b', curlen-position);
continue;
}
if (c == 0x1b) { /* Special command */
mod = _getc(input);
c = _getc(input);
 
if (mod != 0x5b && mod != 0x4f)
continue;
 
if (c == 0x33 && _getc(input) == 0x7e) {
/* Delete */
if (position == curlen)
continue;
for (i=position+1; i<curlen;i++) {
putchar(current[i]);
current[i-1] = current[i];
}
putchar(' ');
rdln_print_c('\b',curlen-position);
curlen--;
}
else if (c == 0x48) { /* Home */
rdln_print_c('\b',position);
position = 0;
}
else if (c == 0x46) { /* End */
for (i=position;i<curlen;i++)
putchar(current[i]);
position = curlen;
}
else if (c == 0x44) { /* Left */
if (position > 0) {
putchar('\b');
position--;
}
continue;
}
else if (c == 0x43) { /* Right */
if (position < curlen) {
putchar(current[position]);
position++;
}
continue;
}
else if (c == 0x41 || c == 0x42) {
/* Up,down */
rdln_print_c('\b',position);
rdln_print_c(' ',curlen);
rdln_print_c('\b',curlen);
if (c == 0x41) /* Up */
histposition--;
else
histposition++;
if (histposition < 0)
histposition = KCONSOLE_HISTORY -1 ;
else
histposition = histposition % KCONSOLE_HISTORY;
current = history[histposition];
printf("%s", current);
curlen = strlen(current);
position = curlen;
continue;
}
continue;
}
if (curlen >= MAX_CMDLINE)
continue;
 
insert_char(current, c, position);
 
curlen++;
for (i=position;i<curlen;i++)
putchar(current[i]);
position++;
rdln_print_c('\b',curlen-position);
}
if (curlen) {
histposition++;
histposition = histposition % KCONSOLE_HISTORY;
}
current[curlen] = '\0';
return current;
}
 
/** Kernel console managing thread.
*
* @param prompt Kernel console prompt (e.g kconsole/panic).
*/
void kconsole(void *prompt)
{
cmd_info_t *cmd_info;
count_t len;
char *cmdline;
 
if (!stdin) {
printf("%s: no stdin\n", __FUNCTION__);
return;
}
while (true) {
cmdline = clever_readline(prompt, stdin);
len = strlen(cmdline);
if (!len)
continue;
cmd_info = parse_cmdline(cmdline, len);
if (!cmd_info)
continue;
if (strncmp(cmd_info->name,"exit", \
min(strlen(cmd_info->name),5)) == 0)
break;
(void) cmd_info->func(cmd_info->argv);
}
}
 
static int parse_int_arg(char *text, size_t len, unative_t *result)
{
char symname[MAX_SYMBOL_NAME];
uintptr_t symaddr;
bool isaddr = false;
bool isptr = false;
/* If we get a name, try to find it in symbol table */
if (text[0] == '&') {
isaddr = true;
text++;len--;
} else if (text[0] == '*') {
isptr = true;
text++;len--;
}
if (text[0] < '0' || text[0] > '9') {
strncpy(symname, text, min(len+1, MAX_SYMBOL_NAME));
symaddr = get_symbol_addr(symname);
if (!symaddr) {
printf("Symbol %s not found.\n",symname);
return -1;
}
if (symaddr == (uintptr_t) -1) {
printf("Duplicate symbol %s.\n",symname);
symtab_print_search(symname);
return -1;
}
if (isaddr)
*result = (unative_t)symaddr;
else if (isptr)
*result = **((unative_t **)symaddr);
else
*result = *((unative_t *)symaddr);
} else { /* It's a number - convert it */
*result = atoi(text);
if (isptr)
*result = *((unative_t *)*result);
}
 
return 0;
}
 
/** Parse command line.
*
* @param cmdline Command line as read from input device.
* @param len Command line length.
*
* @return Structure describing the command.
*/
cmd_info_t *parse_cmdline(char *cmdline, size_t len)
{
index_t start = 0, end = 0;
cmd_info_t *cmd = NULL;
link_t *cur;
int i;
int error = 0;
if (!parse_argument(cmdline, len, &start, &end)) {
/* Command line did not contain alphanumeric word. */
return NULL;
}
 
spinlock_lock(&cmd_lock);
for (cur = cmd_head.next; cur != &cmd_head; cur = cur->next) {
cmd_info_t *hlp;
hlp = list_get_instance(cur, cmd_info_t, link);
spinlock_lock(&hlp->lock);
if (strncmp(hlp->name, &cmdline[start], max(strlen(hlp->name),
end-start+1)) == 0) {
cmd = hlp;
break;
}
spinlock_unlock(&hlp->lock);
}
spinlock_unlock(&cmd_lock);
if (!cmd) {
/* Unknown command. */
printf("Unknown command.\n");
return NULL;
}
 
/* cmd == hlp is locked */
/*
* The command line must be further analyzed and
* the parameters therefrom must be matched and
* converted to those specified in the cmd info
* structure.
*/
 
for (i = 0; i < cmd->argc; i++) {
char *buf;
start = end + 1;
if (!parse_argument(cmdline, len, &start, &end)) {
printf("Too few arguments.\n");
spinlock_unlock(&cmd->lock);
return NULL;
}
error = 0;
switch (cmd->argv[i].type) {
case ARG_TYPE_STRING:
buf = cmd->argv[i].buffer;
strncpy(buf, (const char *) &cmdline[start], min((end - start) + 2, cmd->argv[i].len));
buf[min((end - start) + 1, cmd->argv[i].len - 1)] = '\0';
break;
case ARG_TYPE_INT:
if (parse_int_arg(cmdline+start, end-start+1,
&cmd->argv[i].intval))
error = 1;
break;
case ARG_TYPE_VAR:
if (start != end && cmdline[start] == '"' && cmdline[end] == '"') {
buf = cmd->argv[i].buffer;
strncpy(buf, (const char *) &cmdline[start+1],
min((end-start), cmd->argv[i].len));
buf[min((end - start), cmd->argv[i].len - 1)] = '\0';
cmd->argv[i].intval = (unative_t) buf;
cmd->argv[i].vartype = ARG_TYPE_STRING;
} else if (!parse_int_arg(cmdline+start, end-start+1,
&cmd->argv[i].intval))
cmd->argv[i].vartype = ARG_TYPE_INT;
else {
printf("Unrecognized variable argument.\n");
error = 1;
}
break;
case ARG_TYPE_INVALID:
default:
printf("invalid argument type\n");
error = 1;
break;
}
}
if (error) {
spinlock_unlock(&cmd->lock);
return NULL;
}
start = end + 1;
if (parse_argument(cmdline, len, &start, &end)) {
printf("Too many arguments.\n");
spinlock_unlock(&cmd->lock);
return NULL;
}
spinlock_unlock(&cmd->lock);
return cmd;
}
 
/** Parse argument.
*
* Find start and end positions of command line argument.
*
* @param cmdline Command line as read from the input device.
* @param len Number of characters in cmdline.
* @param start On entry, 'start' contains pointer to the index
* of first unprocessed character of cmdline.
* On successful exit, it marks beginning of the next argument.
* @param end Undefined on entry. On exit, 'end' points to the last character
* of the next argument.
*
* @return false on failure, true on success.
*/
bool parse_argument(char *cmdline, size_t len, index_t *start, index_t *end)
{
int i;
bool found_start = false;
ASSERT(start != NULL);
ASSERT(end != NULL);
for (i = *start; i < len; i++) {
if (!found_start) {
if (is_white(cmdline[i]))
(*start)++;
else
found_start = true;
} else {
if (is_white(cmdline[i]))
break;
}
}
*end = i - 1;
 
return found_start;
}
 
/** @}
*/