diff options
Diffstat (limited to 'src/core/idt.cc')
| -rw-r--r-- | src/core/idt.cc | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/src/core/idt.cc b/src/core/idt.cc new file mode 100644 index 0000000..b808625 --- /dev/null +++ b/src/core/idt.cc @@ -0,0 +1,51 @@ +#include "idt.hpp" +#include "libs/string.hpp" + +IDT_REGISTER IDTR = { + IDT_GATE_SIZE*IDT_MAX_ENTRIES, + IDT_ADDR +}; + +extern u64 INT_DEFAULT,INT_0,INT_14; + +void idt_enable_interrupt(void){ + IDT_DESCRIPTOR d; + d.ign=0; + d.ist=0; + d.selector=0x08; + d.options=IDT_OPT_P|IDT_OPT_PRVL_0|IDT_OPT_TYPE_INT; + + // Write idt entries + for(u16 i=0;i<IDT_MAX_ENTRIES;i++){ + if(i==0){ // Zero-division + d.offset=(u64)&INT_0; + idt_write_descriptor(d, i); + } + else if(i==14){ // Page fault + d.offset=(u64)&INT_14; + idt_write_descriptor(d, i); + } + else { + d.offset=(u64)&INT_DEFAULT; + idt_write_descriptor(d, i); + } + } + + // Enable interrupts + asm( + "lidt (IDTR) \n\t" + "sti \n\t" + ); +} + +void idt_write_descriptor(IDT_DESCRIPTOR desc, u16 index){ + u32 desc0_31=(desc.selector << 16) | desc.offset&0xFFFF; + u32 desc32_63=desc.ist | desc.options | (desc.offset&0xFFFF0000); + u32 desc64_95=desc.offset>>32; + u32 desc96_127=desc.ign; + u32* dst=(u32*)(IDTR.base+index*IDT_GATE_SIZE); + *dst=desc0_31; + *(dst+1)=desc32_63; + *(dst+2)=desc64_95; + *(dst+3)=desc96_127; +}
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