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#include "device/processor.h"
#include "arch/x86_64/tables.h"
#include "include/arch/x86_64/idt.h"
#include "include/arch/x86_64/object.h"
#include "jove.h"
processor_t s_bsp = {
.odir = &_initDirectory
};
struct jove_ObjectDirectory s_processor_dir = {
.entries = {
[0] = {
.type = KO_OBJECT_DIRECTORY,
.data = 2
},
[1] = {
.type = KO_DEV_PROCESSOR,
.data = (uintptr_t)&s_bsp
}
}
};
char s_initial_response_buffer[256] = { 0 };
typedef union msr_efer
{
struct {
uint8_t sce : 1;
uint8_t resv : 7;
uint8_t lme : 1;
uint8_t unk0 : 1;
uint8_t lma : 1;
uint8_t nxe : 1;
uint8_t svme : 1;
uint8_t lmsle : 1;
uint8_t ffxsr : 1;
uint8_t tce : 1;
};
uint32_t v[2];
} msr_efer_t;
typedef union msr_star
{
struct {
uint32_t eip;
uint16_t kcs;
uint16_t ucs;
};
uint32_t v[2];
} msr_star_t;
typedef union msr_lstar
{
uint32_t v[2];
uintptr_t ip;
} msr_lstar_t;
static void
s_enable_sce(void)
{
msr_efer_t feat;
rdmsr(MSR_EFER, &feat.v[0], &feat.v[1]);
feat.sce = 1;
wrmsr(MSR_EFER, feat.v[0], feat.v[1]);
msr_star_t star;
star.kcs = GDT_ENTRY_KERNEL_CODE * sizeof(segment_descriptor_t);
star.ucs = GDT_ENTRY_USER_CODE * sizeof(segment_descriptor_t);
wrmsr(MSR_STAR, star.v[0], star.v[1]);
extern void _syscall_entry(void);
msr_lstar_t lstar;
lstar.ip = (uintptr_t)_syscall_entry;
wrmsr(MSR_LSTAR, lstar.v[0], lstar.v[1]);
}
void
processor_setup(void *_processor)
{
processor_t *processor = (processor_t*)_processor;
gdt_setup(processor);
idt_setup(processor);
wrmsr(MSR_GS_BASE,
(uint32_t)((uintptr_t)_processor & 0xFFFFFFFF),
(uint32_t)((uintptr_t)_processor >> 32));
}
void
bsp_setup(void)
{
uint64_t pd_i = _initDirectory.self.data++;
_initDirectory.entries[pd_i] = (objdir_entry_t) {
.type = KO_OBJECT_DIRECTORY,
.data = (uintptr_t)(&s_processor_dir)
};
_initData.processor_dir = pd_i;
ivt_setup();
s_enable_sce();
processor_setup(&s_bsp);
}
void
rdmsr(uint32_t msr, uint32_t *lo, uint32_t *hi)
{
__asm__ volatile("rdmsr": "=a"(*lo), "=d"(*hi): "c"(msr));
}
void
wrmsr(uint32_t msr, uint32_t lo, uint32_t hi)
{
__asm__ volatile("wrmsr":: "a"(lo), "d"(hi), "c"(msr));
}
void*
processor_current(void)
{
uint64_t r = 0;
rdmsr(MSR_GS_BASE, (uint32_t*)&r, ((uint32_t*)&r) + 1);
return (void*)r;
}
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