18 lines
No EOL
521 B
C
18 lines
No EOL
521 B
C
#include <arch/x86_64/msr.h>
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#include <arch/x86_64/syscall.h>
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#include <stdint.h>
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extern void syscall_entry();
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void __x86_64_syscall_init() {
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uint64_t efer = rdmsr(IA32_EFER);
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efer |= (1 << 0);
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wrmsr(IA32_EFER, efer);
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uint64_t star = 0;
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star |= ((uint64_t)0x28 << 32); // kernel cs
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star |= ((uint64_t)0x30 << 48); // user cs base (SYSCALL adds 16 for CS=0x38, 24 for SS=0x40)
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wrmsr(IA32_STAR, star);
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wrmsr(IA32_LSTAR, (uint64_t)syscall_entry);
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wrmsr(IA32_CSTAR, 0x0);
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wrmsr(IA32_CSTAR + 1, 0x200);
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} |