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https://github.com/Mathewnd/Astral.git
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Matheus
48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
#include <arch/regs.h>
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#include <arch/msr.h>
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void arch_regs_firsttimesetup(arch_regs* regs, arch_extraregs* xregs){
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xregs->mxcsr = 0x1F80; // all exceptions masked
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}
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void arch_regs_saveextra(arch_extraregs* regs){
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// user gs was swapped
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regs->gsbase = rdmsr(MSR_KERNELGSBASE);
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regs->fsbase = rdmsr(MSR_FSBASE);
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asm("fxsave (%%rax)" : : "a"(®s->fx[0]));
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asm("stmxcsr (%%rax)" : : "a"(®s->mxcsr));
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}
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void arch_regs_setupextra(arch_extraregs* regs){
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// gs will be swapped later
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wrmsr(MSR_KERNELGSBASE, regs->gsbase);
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wrmsr(MSR_FSBASE, regs->fsbase);
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asm("fxrstor (%%rax)" : : "a"(®s->fx[0]));
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asm("ldmxcsr (%%rax)" : : "a"(®s->mxcsr));
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}
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void arch_regs_setupkernel(arch_regs* regs, void* ip, void* stack, bool interrupts){
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regs->rip = ip;
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regs->rsp = stack;
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regs->cs = 0x28;
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regs->ds = 0x30;
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regs->es = 0x30;
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regs->fs = 0x30;
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regs->gs = 0x30;
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regs->ss = 0x30;
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regs->rflags = interrupts ? 0x200 : 0;
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}
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void arch_regs_setupuser(arch_regs* regs, void* ip, void* stack, bool interrupts){
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regs->rip = ip;
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regs->rsp = stack;
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regs->cs = 0x38 | 3;
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regs->ds = 0x40 | 3;
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regs->es = 0x40 | 3;
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regs->fs = 0x40 | 3;
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regs->gs = 0x40 | 3;
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regs->ss = 0x40 | 3;
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regs->rflags = interrupts ? 0x200 : 0;
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}
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