void panic_exc(volatile struct intr_ctx ctx)
{
cli();
ctx_dump((struct intr_ctx *)&ctx);
stack_dump((struct intr_ctx *)&ctx);
idle_task_func();
}
void panic(const char *fmt, ...)
{
va_list va;
va_start(va, fmt);
printk("Panic: ");
printkv(fmt, va);
va_end(va);
asm volatile("int $0xf0");
idle_task_func();
}
/* Entry point in to the kernel proper */
_noreturn _asmlinkage void setup(multiboot_info_t *mbi)
{
serio_init();
vga_preinit();
/* Need this mmediately to catch exceptions */
idt_init();
/* print a pretty message */
printk("ScaraOS v0.0.7 for IA-32");
if ( mbi->flags & MBF_CMDLINE ) {
cmdline = __va(mbi->cmdline);
printk(": %s", cmdline);
}
printk("\n");
/* Prints out CPU MHz */
calibrate_delay_loop();
/* Identify CPU features, also needs to be early because
* mm init may need to know which paging features are
* available
*/
cpuid_init();
/* Fire up the kernel memory allocators */
BUG_ON((mbi->flags & MBF_MMAP) == 0);
ia32_mm_init(__va(mbi->mmap), mbi->mmap_length);
/* setup the idle task */
sched_init();
ia32_gdt_finalize();
/* enable hardware interrupts */
pic_init();
/* start jiffie counter */
pit_start_timer1();
/* initialise fdt logic ready for use */
_fdt_init();
/* Setup the init task */
kernel_thread("[init]", init_task, NULL);
/* Finally, enable interupts and let it rip */
sti();
sched();
idle_task_func();
}
unsigned exc_handler(uint32_t exc_num, volatile struct intr_ctx ctx)
{
static const char * const tname[] = {
"UNKNOWN",
"fault",
"trap",
"abort condition",
};
if ( exc[exc_num].handler ) {
(*exc[exc_num].handler)((struct intr_ctx *)&ctx);
return return_from_intr(&ctx);
}
if ( (ctx.cs & __CPL3) == __CPL3 ) {
_sys_exit(~0);
}
cli();
printk("%s: %s @ 0x%.8lx",
tname[exc[exc_num].type], exc[exc_num].name, ctx.eip);
if ( exc[exc_num].err_code ) {
if ( ctx.err_code & 0x1 )
printk(" EXT");
switch ( ctx.err_code & 0x6 ) {
case 0:
printk(" GDT");
break;
case 2:
printk(" IDT");
break;
case 4:
printk(" LDT");
break;
}
printk(" selector=0x%.lx", ctx.err_code & 0xfff8);
}
printk("\n");
ctx_dump((struct intr_ctx *)&ctx);
idle_task_func();
}
static void page_fault(struct intr_ctx *ctx)
{
if ( 0 == (ctx->err_code & (PAGEFAULT_PROTECTION)) ) {
unsigned prot;
if ( (ctx->err_code & PAGEFAULT_WRITE) )
prot = PROT_WRITE;
else
prot = PROT_READ;
if ( !mm_pagefault(__this_task, pf_address(), prot) )
return;
}
if ( ctx->err_code & PAGEFAULT_USER )
_sys_exit(~0);
else{
struct pagefault_fixup *fix;
for(fix = &__rodata_pagefault;
fix < &__rodata_pagefault_end; fix++) {
if ( fix->fault_addr == ctx->eip ) {
ctx->eip = fix->fixup_addr;
return;
}
}
}
cli();
printk("Unhandled #PF in %s mode: %s fault_addr=0x%.8lx/%s%s\n",
(ctx->err_code & PAGEFAULT_USER) ?
"user" : "supervisor",
(ctx->err_code & PAGEFAULT_PROTECTION) ?
"PROTECTION_VIOLATION" : "NONPRESENT",
pf_address(),
(ctx->err_code & PAGEFAULT_WRITE) ?
"WRITE" : "READ",
(ctx->err_code & PAGEFAULT_RESERVED_BIT) ?
" RESERVED_BIT" : "");
ctx_dump(ctx);
idle_task_func();
}