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1 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2003-2004 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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/** @addtogroup mips32
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 * @{
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 */
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/** @file
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 */
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#include <arch.h>
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#include <arch/cp0.h>
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#include <arch/exception.h>
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#include <mm/as.h>
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#include <userspace.h>
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#include <arch/console.h>
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#include <memstr.h>
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#include <proc/thread.h>
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#include <proc/uarg.h>
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#include <print.h>
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#include <syscall/syscall.h>
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#include <sysinfo/sysinfo.h>
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#include <arch/interrupt.h>
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#include <console/chardev.h>
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#include <arch/barrier.h>
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#include <arch/debugger.h>
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#include <genarch/fb/fb.h>
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#include <genarch/fb/visuals.h>
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#include <macros.h>
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#include <ddi/device.h>
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#include <arch/asm/regname.h>
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/* Size of the code jumping to the exception handler code
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 * - J+NOP
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 */
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#define EXCEPTION_JUMP_SIZE  8
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#define TLB_EXC    ((char *) 0x80000000)
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#define NORM_EXC   ((char *) 0x80000180)
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#define CACHE_EXC  ((char *) 0x80000100)
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/* Why the linker moves the variable 64K away in assembler
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 * when not in .text section?
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 */
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/* Stack pointer saved when entering user mode */
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uintptr_t supervisor_sp __attribute__ ((section (".text")));
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count_t cpu_count = 0;
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void arch_pre_main(void *entry __attribute__((unused)), bootinfo_t *bootinfo)
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{
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    /* Setup usermode */
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    init.cnt = bootinfo->cnt;
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    count_t i;
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    for (i = 0; i < min3(bootinfo->cnt, TASKMAP_MAX_RECORDS, CONFIG_INIT_TASKS); i++) {
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        init.tasks[i].addr = bootinfo->tasks[i].addr;
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        init.tasks[i].size = bootinfo->tasks[i].size;
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    }
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    for (i = 0; i < CPUMAP_MAX_RECORDS; i++) {
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        if ((bootinfo->cpumap & (1 << i)) != 0)
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            cpu_count++;
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    }
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}
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void arch_pre_mm_init(void)
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{
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    /* It is not assumed by default */
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    interrupts_disable();
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    /* Initialize dispatch table */
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    exception_init();
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    /* Copy the exception vectors to the right places */
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    memcpy(TLB_EXC, (char *) tlb_refill_entry, EXCEPTION_JUMP_SIZE);
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    smc_coherence_block(TLB_EXC, EXCEPTION_JUMP_SIZE);
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    memcpy(NORM_EXC, (char *) exception_entry, EXCEPTION_JUMP_SIZE);
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    smc_coherence_block(NORM_EXC, EXCEPTION_JUMP_SIZE);
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    memcpy(CACHE_EXC, (char *) cache_error_entry, EXCEPTION_JUMP_SIZE);
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    smc_coherence_block(CACHE_EXC, EXCEPTION_JUMP_SIZE);
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    /*
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     * Switch to BEV normal level so that exception vectors point to the
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     * kernel. Clear the error level.
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     */
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    cp0_status_write(cp0_status_read() &
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        ~(cp0_status_bev_bootstrap_bit | cp0_status_erl_error_bit));
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    /*
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     * Mask all interrupts
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     */
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    cp0_mask_all_int();
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    debugger_init();
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}
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void arch_post_mm_init(void)
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{
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    interrupt_init();
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    console_init(device_assign_devno());
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#ifdef CONFIG_FB
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    /* GXemul framebuffer */
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    fb_properties_t gxemul_prop = {
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        .addr = 0x12000000,
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        .offset = 0,
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        .x = 640,
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        .y = 480,
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        .scan = 1920,
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        .visual = VISUAL_BGR_8_8_8,
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    };
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    fb_init(&gxemul_prop);
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#endif
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#ifdef MACHINE_msim
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    sysinfo_set_item_val("machine.msim", NULL, 1);
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#endif
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#ifdef MACHINE_simics
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    sysinfo_set_item_val("machine.simics", NULL, 1);
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#endif
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#ifdef MACHINE_bgxemul
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    sysinfo_set_item_val("machine.bgxemul", NULL, 1);
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#endif
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#ifdef MACHINE_lgxemul
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    sysinfo_set_item_val("machine.lgxemul", NULL, 1);
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#endif
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}
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void arch_post_cpu_init(void)
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{
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}
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void arch_pre_smp_init(void)
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{
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}
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void arch_post_smp_init(void)
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{
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}
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void calibrate_delay_loop(void)
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{
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}
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1078 jermar 177
void userspace(uspace_arg_t *kernel_uarg)
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{
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    /* EXL = 1, UM = 1, IE = 1 */
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    cp0_status_write(cp0_status_read() | (cp0_status_exl_exception_bit |
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        cp0_status_um_bit | cp0_status_ie_enabled_bit));
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    cp0_epc_write((uintptr_t) kernel_uarg->uspace_entry);
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    userspace_asm(((uintptr_t) kernel_uarg->uspace_stack + PAGE_SIZE),
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        (uintptr_t) kernel_uarg->uspace_uarg,
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        (uintptr_t) kernel_uarg->uspace_entry);
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    while (1);
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}
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/** Perform mips32 specific tasks needed before the new task is run. */
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void before_task_runs_arch(void)
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{
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}
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/** Perform mips32 specific tasks needed before the new thread is scheduled. */
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void before_thread_runs_arch(void)
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{
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    supervisor_sp = (uintptr_t) &THREAD->kstack[THREAD_STACK_SIZE -
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        SP_DELTA];
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}
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void after_thread_ran_arch(void)
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{
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}
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1121 jermar 206
/** Set thread-local-storage pointer
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 *
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 * We have it currently in K1, it is
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 * possible to have it separately in the future.
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 */
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unative_t sys_tls_set(unative_t addr)
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{
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    return 0;
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}
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void arch_reboot(void)
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{
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    ___halt();
2722 decky 219
 
3880 decky 220
    while (1);
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}
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/** Construct function pointer
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 *
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 * @param fptr   function pointer structure
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 * @param addr   function address
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 * @param caller calling function address
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 *
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 * @return address of the function pointer
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 *
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 */
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void *arch_construct_function(fncptr_t *fptr, void *addr, void *caller)
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{
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    return addr;
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}
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/** @}
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 */