| 39,6 → 39,7 |
|---|
| .text |
| .global interrupt_handlers |
| .global panic_printf |
| .global cpuid |
| |
| panic_printf: |
| movq $halt, (%rsp) |
| 46,8 → 47,9 |
|---|
| |
| .global has_cpuid |
| .global rdtsc |
| |
| |
| .global read_efer_flag |
| .global set_efer_flag |
| |
| ## Determine CPUID support |
| # |
| # Return 0 in EAX if CPUID is not support, 1 if supported. |
| 70,12 → 72,36 |
|---|
| popq %rbx |
| ret |
| |
| cpuid: |
| movq %rbx, %r10 # we have to preserve rbx across function calls |
| |
| movl %edi,%eax # load the command into %eax |
| |
| cpuid |
| movl %eax,0(%rsi) |
| movl %ebx,4(%rsi) |
| movl %ecx,8(%rsi) |
| movl %edx,12(%rsi) |
| |
| movq %r10, %rbx |
| ret |
| |
| rdtsc: |
| xorq %rax,%rax |
| rdtsc |
| ret |
| |
| set_efer_flag: |
| movq $0xc0000080, %rcx |
| rdmsr |
| btsl %edi, %eax |
| wrmsr |
| ret |
| |
| read_efer_flag: |
| movq $0xc0000080, %rcx |
| rdmsr |
| ret |
| |
| # Push all general purpose registers on stack except %rbp, %rsp |
| .macro push_all_gpr |