diff options
Diffstat (limited to 'kernel/cpu/idt.c')
| -rw-r--r-- | kernel/cpu/idt.c | 40 |
1 files changed, 30 insertions, 10 deletions
diff --git a/kernel/cpu/idt.c b/kernel/cpu/idt.c index 8bddc21..d071d29 100644 --- a/kernel/cpu/idt.c +++ b/kernel/cpu/idt.c @@ -3,6 +3,7 @@ #include <comus/asm.h> #include <comus/cpu.h> #include <comus/drivers/pit.h> +#include <comus/procs.h> #include <comus/memory.h> #include "idt.h" @@ -42,8 +43,12 @@ struct idtr { __attribute__((aligned(0x10))) static struct idt_entry idt[256]; static struct idtr idtr; -// from idt.S extern void *isr_stub_table[]; +extern char kern_stack_start[]; +extern char kern_stack_end[]; + +// current register state on interrupt +static struct cpu_regs *state; // initialize and load the IDT void idt_init(void) @@ -58,11 +63,10 @@ void idt_init(void) uint64_t isr = (uint64_t)isr_stub_table[vector]; // interrupts before 0x20 are for cpu exceptions - uint8_t gate_type = (vector < 0x20) ? GATE_64BIT_TRAP : GATE_64BIT_INT; entry->kernel_cs = 0x08; // offset of 1 into GDT entry->ist = 0; - entry->flags = PRESENT | RING0 | gate_type; + entry->flags = PRESENT | RING0 | GATE_64BIT_INT; entry->isr_low = isr & 0xffff; entry->isr_mid = (isr >> 16) & 0xffff; entry->isr_high = (isr >> 32) & 0xffffffff; @@ -115,14 +119,11 @@ char *EXCEPTIONS[] = { "Reserved", }; -void idt_exception_handler(uint64_t exception, uint64_t code, - struct cpu_regs *state) +__attribute__((noreturn)) void idt_exception_handler(uint64_t exception, + uint64_t code) { uint64_t cr2; - // make sure were in the kernel memory context - mem_ctx_switch(kernel_mem_ctx); - switch (exception) { case EX_PAGE_FAULT: // page faults store the offending address in cr2 @@ -151,16 +152,35 @@ void idt_exception_handler(uint64_t exception, uint64_t code, } } +void isr_save(struct cpu_regs *regs) +{ + // make sure were in the kernel memory context + mem_ctx_switch(kernel_mem_ctx); + + // save pointer to registers + state = regs; + + // if we have a kernel stack pointer + // we should return to not save kernel context + // data to userspace + if (regs->rsp >= (size_t)kern_stack_start && + regs->rsp <= (size_t)kern_stack_end) + return; + + // save registers in current_pcb + if (current_pcb != NULL) + current_pcb->regs = *regs; +} + void idt_pic_eoi(uint8_t exception) { pic_eoi(exception - PIC_REMAP_OFFSET); } -int counter = 0; - void idt_pic_timer(void) { ticks++; + pcb_on_tick(); } void idt_pic_keyboard(void) |