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1 jermar 1
/*
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 * Copyright (C) 2001-2004 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <arch/asm.h>
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#include <arch/context.h>
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#include <print.h>
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#include <config.h>
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#include <time/clock.h>
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#include <proc/scheduler.h>
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#include <proc/thread.h>
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#include <proc/task.h>
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#include <mm/vm.h>
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#include <main/kinit.h>
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#include <cpu.h>
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#include <mm/heap.h>
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#ifdef __SMP__
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#include <arch/smp/apic.h>
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#include <arch/smp/mp.h>
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#endif /* __SMP__ */
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#include <mm/frame.h>
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#include <mm/page.h>
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#include <mm/tlb.h>
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#include <synch/waitq.h>
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#include <arch.h>
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char *project = "SPARTAN kernel";
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char *copyright = "Copyright (C) 2001-2005 Jakub Jermar";
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config_t config;
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context_t ctx;
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/*
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 * These 'hardcoded' variables will be intialised by
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 * the linker with appropriate sizes and addresses.
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 */
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__u32 hardcoded_load_address = 0;
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__u32 hardcoded_ktext_size = 0;
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__u32 hardcoded_kdata_size = 0;
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void main_bsp(void);
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void main_ap(void);
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/*
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 * These two functions prevent stack from underflowing during the
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 * kernel boot phase when SP is set to the very top of the reserved
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 * space. The stack could get corrupted by a fooled compiler-generated
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 * pop sequence otherwise.
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 */
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static void main_bsp_separated_stack(void);
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static void main_ap_separated_stack(void);
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/*
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 * Executed by the bootstrap processor. cpu_priority_high()'d
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 */
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void main_bsp(void)
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{
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    config.cpu_count = 1;
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    config.cpu_active = 1;
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    config.base = hardcoded_load_address;
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    config.memory_size = CONFIG_MEMORY_SIZE;
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    config.kernel_size = hardcoded_ktext_size + hardcoded_kdata_size + CONFIG_HEAP_SIZE + CONFIG_STACK_SIZE;
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    context_save(&ctx);
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    ctx.sp = config.base + config.kernel_size - 8;
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    ctx.pc = (__address) main_bsp_separated_stack;
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    context_restore(&ctx);
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    /* not reached */
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}
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void main_bsp_separated_stack(void) {
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    vm_t *m;
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    task_t *k;
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    thread_t *t;
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    arch_init();
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    printf("%s, %s\n", project, copyright);
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    printf("%L: hardcoded_ktext_size=%dK, hardcoded_kdata_size=%dK\n",
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        config.base, hardcoded_ktext_size/1024, hardcoded_kdata_size/1024);
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    heap_init(config.base + hardcoded_ktext_size + hardcoded_kdata_size, CONFIG_HEAP_SIZE);
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    frame_init();
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    page_init();
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    tlb_init();
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    #ifdef __SMP__
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    mp_init();  /* Multiprocessor */
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    #endif /* __SMP__ */
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    cpu_init();
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    calibrate_delay_loop();
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    timeout_init();
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    scheduler_init();
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    task_init();
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    thread_init();
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    /*
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     * Create kernel vm mapping.
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     */
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    m = vm_create();
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    if (!m) panic("can't create kernel vm address space\n");
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    /*
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     * Create kernel task.
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     */
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    k = task_create(m);
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    if (!k) panic("can't create kernel task\n");
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    /*
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     * Create the first thread.
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     */
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    t = thread_create(kinit, NULL, k, 0);
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    if (!t) panic("can't create kinit thread\n");
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    thread_ready(t);
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    /*
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     * This call to scheduler() will return to kinit,
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     * starting the thread of kernel threads.
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     */
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    scheduler();
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    /* not reached */
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}
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#ifdef __SMP__
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/*
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 * Executed by application processors. cpu_priority_high()'d
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 * Temporary stack is at ctx.sp which was set during BP boot.
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 */
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void main_ap(void)
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{
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    /*
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     * Incrementing the active CPU counter will guarantee that the
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     * pm_init() will not attempt to build GDT and IDT tables again.
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     * Neither frame_init() will do the complete thing. Neither cpu_init()
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     * will do.
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     */
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    config.cpu_active++;
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    arch_init();
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    frame_init();
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    page_init();
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    cpu_init();
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    calibrate_delay_loop();
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    l_apic_init();
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    l_apic_debug();
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    /*
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     * If we woke kmp up before we left the kernel stack, we could
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     * collide with another CPU coming up. To prevent this, we
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     * switch to this cpu's private stack prior to waking kmp up.
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     */
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    CPU->saved_context.sp = (__address) &CPU->stack[CPU_STACK_SIZE-8];
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    CPU->saved_context.pc = (__address) main_ap_separated_stack;
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    context_restore(&CPU->saved_context);
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    /* not reached */
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}
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void main_ap_separated_stack(void)
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{
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    /*
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     * Configure timeouts for this cpu.
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     */
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    timeout_init();
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    waitq_wakeup(&ap_completion_wq, WAKEUP_FIRST);
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    scheduler();
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    /* not reached */
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}
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#endif /* __SMP__*/