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kernel - v0.7 beta

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+ acpi: add acpi support
+ lapic: add lapic support
+ ioapic: add ioapic support
+ arch/x86_64: add support for "syscall"/"sysret"
This commit is contained in:
RaphProductions 2025-05-15 18:49:09 +02:00
parent 4d52bac946
commit a8e919b033
53 changed files with 772 additions and 331 deletions
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18
kernel/src/arch/x86_64/syscall.c Normal file
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@ -0,0 +1,18 @@
#include <arch/x86_64/msr.h>
#include <arch/x86_64/syscall.h>
#include <stdint.h>
extern void syscall_entry();
void __x86_64_syscall_init() {
uint64_t efer = rdmsr(IA32_EFER);
efer |= (1 << 0);
wrmsr(IA32_EFER, efer);
uint64_t star = 0;
star |= ((uint64_t)0x28 << 32); // kernel cs
star |= ((uint64_t)0x30 << 48); // user cs base (SYSCALL adds 16 for CS=0x38, 24 for SS=0x40)
wrmsr(IA32_STAR, star);
wrmsr(IA32_LSTAR, (uint64_t)syscall_entry);
wrmsr(IA32_CSTAR, 0x0);
wrmsr(IA32_CSTAR + 1, 0x200);
}