33 lines
816 B
C
33 lines
816 B
C
#include <zinnia/errno.h>
|
|
#include <zinnia/syscall.h>
|
|
#include <arch/archctl.h>
|
|
#include <arch/mem.h>
|
|
#include <uapi/archctl.h>
|
|
#include <x86_64/asm.h>
|
|
#include <x86_64/defs.h>
|
|
|
|
struct syscall_ret arch_archctl(uintptr_t op, uintptr_t arg) {
|
|
struct syscall_ret ret = {};
|
|
|
|
switch (op) {
|
|
case __ARCHCTL_SET_FSBASE:
|
|
if (!arch_mem_addr_is_user(arg)) {
|
|
ret.errno = EINVAL;
|
|
return ret;
|
|
}
|
|
asm_wrmsr(MSR_FS_BASE, arg);
|
|
return ret;
|
|
case __ARCHCTL_SET_GSBASE:
|
|
if (!arch_mem_addr_is_user(arg)) {
|
|
ret.errno = EINVAL;
|
|
return ret;
|
|
}
|
|
// Update the inactive GSBASE MSR, not ours.
|
|
asm_wrmsr(MSR_KERNEL_GS_BASE, arg);
|
|
return ret;
|
|
default:
|
|
ret.errno = EINVAL;
|
|
return ret;
|
|
}
|
|
}
|