source: mainline/kernel/arch/mips32/src/mips32.c@ 430afff

/*
 * Copyright (c) 2003-2004 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 mips32
 * @{
 */
/** @file
 */

#include <arch.h>
#include <arch/cp0.h>
#include <arch/exception.h>
#include <mm/as.h>

#include <userspace.h>
#include <arch/console.h>
#include <memstr.h>
#include <proc/thread.h>
#include <proc/uarg.h>
#include <print.h>
#include <syscall/syscall.h>
#include <sysinfo/sysinfo.h>

#include <arch/interrupt.h>
#include <console/chardev.h>
#include <arch/barrier.h>
#include <arch/debugger.h>
#include <genarch/fb/fb.h>
#include <genarch/fb/visuals.h>
#include <macros.h>
#include <ddi/device.h>

#include <arch/asm/regname.h>

/* Size of the code jumping to the exception handler code
 * - J+NOP
 */
#define EXCEPTION_JUMP_SIZE  8

#define TLB_EXC    ((char *) 0x80000000)
#define NORM_EXC   ((char *) 0x80000180)
#define CACHE_EXC  ((char *) 0x80000100)


/* Why the linker moves the variable 64K away in assembler
 * when not in .text section?
 */

/* Stack pointer saved when entering user mode */
uintptr_t supervisor_sp __attribute__ ((section (".text")));

count_t cpu_count = 0;

void arch_pre_main(void *entry __attribute__((unused)), bootinfo_t *bootinfo)
{
        /* Setup usermode */
        init.cnt = bootinfo->cnt;
        
        count_t i;
        for (i = 0; i < min3(bootinfo->cnt, TASKMAP_MAX_RECORDS, CONFIG_INIT_TASKS); i++) {
                init.tasks[i].addr = bootinfo->tasks[i].addr;
                init.tasks[i].size = bootinfo->tasks[i].size;
        }
        
        for (i = 0; i < CPUMAP_MAX_RECORDS; i++) {
                if ((bootinfo->cpumap & (1 << i)) != 0)
                        cpu_count++;
        }
}

void arch_pre_mm_init(void)
{
        /* It is not assumed by default */
        interrupts_disable();
        
        /* Initialize dispatch table */
        exception_init();

        /* Copy the exception vectors to the right places */
        memcpy(TLB_EXC, (char *) tlb_refill_entry, EXCEPTION_JUMP_SIZE);
        smc_coherence_block(TLB_EXC, EXCEPTION_JUMP_SIZE);
        memcpy(NORM_EXC, (char *) exception_entry, EXCEPTION_JUMP_SIZE);
        smc_coherence_block(NORM_EXC, EXCEPTION_JUMP_SIZE);
        memcpy(CACHE_EXC, (char *) cache_error_entry, EXCEPTION_JUMP_SIZE);
        smc_coherence_block(CACHE_EXC, EXCEPTION_JUMP_SIZE);
        
        /*
         * Switch to BEV normal level so that exception vectors point to the
         * kernel. Clear the error level.
         */
        cp0_status_write(cp0_status_read() &
            ~(cp0_status_bev_bootstrap_bit | cp0_status_erl_error_bit));
        
        /*
         * Mask all interrupts
         */
        cp0_mask_all_int();
        
        debugger_init();
}

void arch_post_mm_init(void)
{
        interrupt_init();
        console_init(device_assign_devno());
#ifdef CONFIG_FB
        /* GXemul framebuffer */
        fb_properties_t gxemul_prop = {
                .addr = 0x12000000,
                .offset = 0,
                .x = 640,
                .y = 480,
                .scan = 1920,
                .visual = VISUAL_BGR_8_8_8,
        };
        fb_init(&gxemul_prop);
#endif

#ifdef MACHINE_msim
        sysinfo_set_item_val("machine.msim", NULL, 1);
#endif

#ifdef MACHINE_simics
        sysinfo_set_item_val("machine.simics", NULL, 1);
#endif

#ifdef MACHINE_bgxemul
        sysinfo_set_item_val("machine.bgxemul", NULL, 1);
#endif

#ifdef MACHINE_lgxemul
        sysinfo_set_item_val("machine.lgxemul", NULL, 1);
#endif
}

void arch_post_cpu_init(void)
{
}

void arch_pre_smp_init(void)
{
}

void arch_post_smp_init(void)
{
}

void calibrate_delay_loop(void)
{
}

void userspace(uspace_arg_t *kernel_uarg)
{
        /* EXL = 1, UM = 1, IE = 1 */
        cp0_status_write(cp0_status_read() | (cp0_status_exl_exception_bit |
            cp0_status_um_bit | cp0_status_ie_enabled_bit));
        cp0_epc_write((uintptr_t) kernel_uarg->uspace_entry);
        userspace_asm(((uintptr_t) kernel_uarg->uspace_stack + PAGE_SIZE), 
            (uintptr_t) kernel_uarg->uspace_uarg,
            (uintptr_t) kernel_uarg->uspace_entry);
        
        while (1);
}

/** Perform mips32 specific tasks needed before the new task is run. */
void before_task_runs_arch(void)
{
}

/** Perform mips32 specific tasks needed before the new thread is scheduled. */
void before_thread_runs_arch(void)
{
        supervisor_sp = (uintptr_t) &THREAD->kstack[THREAD_STACK_SIZE -
            SP_DELTA];
}

void after_thread_ran_arch(void)
{
}

/** Set thread-local-storage pointer
 *
 * We have it currently in K1, it is
 * possible to have it separately in the future.
 */
unative_t sys_tls_set(unative_t addr)
{
        return 0;
}

void arch_reboot(void)
{
        ___halt();
        
        while (1);
}

/** Construct function pointer
 *
 * @param fptr   function pointer structure
 * @param addr   function address
 * @param caller calling function address
 *
 * @return address of the function pointer
 *
 */
void *arch_construct_function(fncptr_t *fptr, void *addr, void *caller)
{
        return addr;
}

/** @}
 */