0,0 → 1,318 |
/* |
* Copyright (C) 2001-2004 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. |
*/ |
|
/** |
* @file main.c |
* @brief Main initialization kernel function for all processors. |
* |
* During kernel boot, all processors, after architecture dependent |
* initialization, start executing code found in this file. After |
* bringing up all subsystems, control is passed to scheduler(). |
* |
* The bootstrap processor starts executing main_bsp() while |
* the application processors start executing main_ap(). |
* |
* @see scheduler() |
* @see main_bsp() |
* @see main_ap() |
*/ |
|
#include <arch/asm.h> |
#include <context.h> |
#include <print.h> |
#include <panic.h> |
#include <debug.h> |
#include <config.h> |
#include <time/clock.h> |
#include <proc/scheduler.h> |
#include <proc/thread.h> |
#include <proc/task.h> |
#include <main/kinit.h> |
#include <main/version.h> |
#include <console/kconsole.h> |
#include <cpu.h> |
#include <align.h> |
#include <interrupt.h> |
#include <arch/mm/memory_init.h> |
#include <mm/frame.h> |
#include <mm/page.h> |
#include <genarch/mm/page_pt.h> |
#include <mm/tlb.h> |
#include <mm/as.h> |
#include <mm/slab.h> |
#include <synch/waitq.h> |
#include <synch/futex.h> |
#include <arch/arch.h> |
#include <arch.h> |
#include <arch/faddr.h> |
#include <typedefs.h> |
#include <ipc/ipc.h> |
#include <macros.h> |
#include <adt/btree.h> |
|
#ifdef CONFIG_SMP |
#include <arch/smp/apic.h> |
#include <arch/smp/mps.h> |
#endif /* CONFIG_SMP */ |
#include <smp/smp.h> |
|
/** Global configuration structure. */ |
config_t config = { |
.mm_initialized = false |
}; |
|
/** Initial user-space tasks */ |
init_t init = { |
0 |
}; |
|
context_t ctx; |
|
/** |
* These 'hardcoded' variables will be intialized by |
* the linker or the low level assembler code with |
* appropriate sizes and addresses. |
*/ |
__address hardcoded_load_address = 0; |
size_t hardcoded_ktext_size = 0; |
size_t hardcoded_kdata_size = 0; |
|
void main_bsp(void); |
void main_ap(void); |
|
/* |
* These two functions prevent stack from underflowing during the |
* kernel boot phase when SP is set to the very top of the reserved |
* space. The stack could get corrupted by a fooled compiler-generated |
* pop sequence otherwise. |
*/ |
static void main_bsp_separated_stack(void); |
#ifdef CONFIG_SMP |
static void main_ap_separated_stack(void); |
#endif |
|
#define CONFIG_STACK_SIZE ((1<<STACK_FRAMES)*STACK_SIZE) |
|
/** Main kernel routine for bootstrap CPU. |
* |
* Initializes the kernel by bootstrap CPU. |
* This function passes control directly to |
* main_bsp_separated_stack(). |
* |
* Assuming interrupts_disable(). |
* |
*/ |
void main_bsp(void) |
{ |
__address stackaddr; |
|
config.cpu_count = 1; |
config.cpu_active = 1; |
|
config.base = hardcoded_load_address; |
config.memory_size = get_memory_size(); |
|
config.kernel_size = ALIGN_UP(hardcoded_ktext_size + hardcoded_kdata_size, PAGE_SIZE); |
stackaddr = config.base + config.kernel_size; |
|
/* Avoid placing kernel on top of init */ |
count_t i; |
bool overlap = false; |
for (i = 0; i < init.cnt; i++) |
if (PA_overlaps(stackaddr, CONFIG_STACK_SIZE, init.tasks[i].addr, init.tasks[i].size)) { |
stackaddr = ALIGN_UP(init.tasks[i].addr + init.tasks[i].size, CONFIG_STACK_SIZE); |
init.tasks[i].size = ALIGN_UP(init.tasks[i].size, CONFIG_STACK_SIZE) + CONFIG_STACK_SIZE; |
overlap = true; |
} |
|
if (!overlap) |
config.kernel_size += CONFIG_STACK_SIZE; |
|
context_save(&ctx); |
context_set(&ctx, FADDR(main_bsp_separated_stack), stackaddr, THREAD_STACK_SIZE); |
context_restore(&ctx); |
/* not reached */ |
} |
|
|
/** Main kernel routine for bootstrap CPU using new stack. |
* |
* Second part of main_bsp(). |
* |
*/ |
void main_bsp_separated_stack(void) |
{ |
task_t *k; |
thread_t *t; |
count_t i; |
|
the_initialize(THE); |
|
/* |
* kconsole data structures must be initialized very early |
* because other subsystems will register their respective |
* commands. |
*/ |
kconsole_init(); |
|
/* |
* Exception handler initialization, before architecture |
* starts adding its own handlers |
*/ |
exc_init(); |
|
/* |
* Memory management subsystems initialization. |
*/ |
arch_pre_mm_init(); |
frame_init(); /* Initialize at least 1 memory segment big enough for slab to work */ |
slab_cache_init(); |
btree_init(); |
as_init(); |
page_init(); |
tlb_init(); |
config.mm_initialized = true; |
arch_post_mm_init(); |
|
version_print(); |
printf("%.*p: hardcoded_ktext_size=%zdK, hardcoded_kdata_size=%zdK\n", sizeof(__address) * 2, config.base, hardcoded_ktext_size / 1024, hardcoded_kdata_size / 1024); |
|
arch_pre_smp_init(); |
smp_init(); |
|
slab_enable_cpucache(); /* Slab must be initialized AFTER we know the number of processors */ |
|
printf("config.memory_size=%zdM\n", config.memory_size/(1024*1024)); |
printf("config.cpu_count=%zd\n", config.cpu_count); |
cpu_init(); |
|
calibrate_delay_loop(); |
timeout_init(); |
scheduler_init(); |
task_init(); |
thread_init(); |
futex_init(); |
|
for (i = 0; i < init.cnt; i++) |
printf("init[%zd].addr=%.*p, init[%zd].size=%zd\n", i, sizeof(__address)*2, init.tasks[i].addr, i, init.tasks[i].size); |
|
ipc_init(); |
|
/* |
* Create kernel task. |
*/ |
k = task_create(AS_KERNEL, "KERNEL"); |
if (!k) |
panic("can't create kernel task\n"); |
|
/* |
* Create the first thread. |
*/ |
t = thread_create(kinit, NULL, k, 0, "kinit"); |
if (!t) |
panic("can't create kinit thread\n"); |
thread_ready(t); |
|
/* |
* This call to scheduler() will return to kinit, |
* starting the thread of kernel threads. |
*/ |
scheduler(); |
/* not reached */ |
} |
|
|
#ifdef CONFIG_SMP |
/** Main kernel routine for application CPUs. |
* |
* Executed by application processors, temporary stack |
* is at ctx.sp which was set during BP boot. |
* This function passes control directly to |
* main_ap_separated_stack(). |
* |
* Assuming interrupts_disable()'d. |
* |
*/ |
void main_ap(void) |
{ |
/* |
* Incrementing the active CPU counter will guarantee that the |
* pm_init() will not attempt to build GDT and IDT tables again. |
* Neither frame_init() will do the complete thing. Neither cpu_init() |
* will do. |
*/ |
config.cpu_active++; |
|
/* |
* The THE structure is well defined because ctx.sp is used as stack. |
*/ |
the_initialize(THE); |
|
arch_pre_mm_init(); |
frame_init(); |
page_init(); |
tlb_init(); |
arch_post_mm_init(); |
|
cpu_init(); |
|
calibrate_delay_loop(); |
|
l_apic_init(); |
l_apic_debug(); |
|
the_copy(THE, (the_t *) CPU->stack); |
|
/* |
* If we woke kmp up before we left the kernel stack, we could |
* collide with another CPU coming up. To prevent this, we |
* switch to this cpu's private stack prior to waking kmp up. |
*/ |
context_set(&CPU->saved_context, FADDR(main_ap_separated_stack), (__address) CPU->stack, CPU_STACK_SIZE); |
context_restore(&CPU->saved_context); |
/* not reached */ |
} |
|
|
/** Main kernel routine for application CPUs using new stack. |
* |
* Second part of main_ap(). |
* |
*/ |
void main_ap_separated_stack(void) |
{ |
/* |
* Configure timeouts for this cpu. |
*/ |
timeout_init(); |
|
waitq_wakeup(&ap_completion_wq, WAKEUP_FIRST); |
scheduler(); |
/* not reached */ |
} |
#endif /* CONFIG_SMP */ |