0,0 → 1,351 |
/* |
* 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. |
*/ |
|
/** @addtogroup main |
* @{ |
*/ |
|
/** |
* @file |
* @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 <time/timeout.h> |
#include <proc/scheduler.h> |
#include <proc/thread.h> |
#include <proc/task.h> |
#include <proc/tasklet.h> |
#include <main/kinit.h> |
#include <main/version.h> |
#include <console/kconsole.h> |
#include <cpu.h> |
#include <align.h> |
#include <interrupt.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 <ipc/ipc.h> |
#include <macros.h> |
#include <adt/btree.h> |
#include <console/klog.h> |
#include <smp/smp.h> |
#include <ddi/ddi.h> |
|
/** Global configuration structure. */ |
config_t config; |
|
/** Initial user-space tasks */ |
init_t init = { |
.cnt = 0 |
}; |
|
/** Boot allocations. */ |
ballocs_t ballocs = { |
.base = NULL, |
.size = 0 |
}; |
|
context_t ctx; |
|
/* |
* These 'hardcoded' variables will be intialized by |
* the linker or the low level assembler code with |
* appropriate sizes and addresses. |
*/ |
|
/**< Virtual address of where the kernel is loaded. */ |
uintptr_t hardcoded_load_address = 0; |
/**< Size of the kernel code in bytes. */ |
size_t hardcoded_ktext_size = 0; |
/**< Size of the kernel data in bytes. */ |
size_t hardcoded_kdata_size = 0; |
/**< Lowest safe stack virtual address. */ |
uintptr_t stack_safe = 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) |
{ |
config.cpu_count = 1; |
config.cpu_active = 1; |
|
config.base = hardcoded_load_address; |
config.kernel_size = ALIGN_UP(hardcoded_ktext_size + |
hardcoded_kdata_size, PAGE_SIZE); |
config.stack_size = CONFIG_STACK_SIZE; |
|
/* Initialy the stack is placed just after the kernel */ |
config.stack_base = config.base + config.kernel_size; |
|
/* Avoid placing stack on top of init */ |
count_t i; |
for (i = 0; i < init.cnt; i++) { |
if (PA_overlaps(config.stack_base, config.stack_size, |
init.tasks[i].addr, init.tasks[i].size)) |
config.stack_base = ALIGN_UP(init.tasks[i].addr + |
init.tasks[i].size, config.stack_size); |
} |
|
/* Avoid placing stack on top of boot allocations. */ |
if (ballocs.size) { |
if (PA_overlaps(config.stack_base, config.stack_size, |
ballocs.base, ballocs.size)) |
config.stack_base = ALIGN_UP(ballocs.base + |
ballocs.size, PAGE_SIZE); |
} |
|
if (config.stack_base < stack_safe) |
config.stack_base = ALIGN_UP(stack_safe, PAGE_SIZE); |
|
context_save(&ctx); |
context_set(&ctx, FADDR(main_bsp_separated_stack), config.stack_base, |
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(); |
ddi_init(); |
tasklet_init(); |
arch_post_mm_init(); |
|
version_print(); |
printf("kernel: %.*p hardcoded_ktext_size=%zd KB, " |
"hardcoded_kdata_size=%zd KB\n", sizeof(uintptr_t) * 2, |
config.base, SIZE2KB(hardcoded_ktext_size), |
SIZE2KB(hardcoded_kdata_size)); |
printf("stack: %.*p size=%zd KB\n", sizeof(uintptr_t) * 2, |
config.stack_base, SIZE2KB(config.stack_size)); |
|
arch_pre_smp_init(); |
smp_init(); |
/* Slab must be initialized after we know the number of processors. */ |
slab_enable_cpucache(); |
|
printf("Detected %zu CPU(s), %llu MB free memory\n", |
config.cpu_count, SIZE2MB(zone_total_size())); |
cpu_init(); |
|
calibrate_delay_loop(); |
clock_counter_init(); |
timeout_init(); |
scheduler_init(); |
task_init(); |
thread_init(); |
futex_init(); |
klog_init(); |
|
if (init.cnt > 0) { |
for (i = 0; i < init.cnt; i++) |
printf("init[%zd].addr=%.*p, init[%zd].size=%zd\n", i, |
sizeof(uintptr_t) * 2, init.tasks[i].addr, i, |
init.tasks[i].size); |
} else |
printf("No init binaries found\n"); |
|
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", true); |
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 BSP 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 |
* *_init() functions can find out that they need to |
* do initialization for AP only. |
*/ |
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(); |
arch_post_cpu_init(); |
|
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), |
(uintptr_t) 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 */ |
|
/** @} |
*/ |