From 36d7c86a1e9e72d689d672a0e8576adbc740d541 Mon Sep 17 00:00:00 2001 From: Marvin Borner Date: Tue, 8 Sep 2020 15:29:38 +0200 Subject: Some work on CPU stuff (soon: SMP) --- libc/cpu.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) (limited to 'libc/cpu.c') diff --git a/libc/cpu.c b/libc/cpu.c index 0425dc8..b8d250b 100644 --- a/libc/cpu.c +++ b/libc/cpu.c @@ -1,7 +1,9 @@ // MIT License, Copyright (c) 2020 Marvin Borner // This file is a wrapper around some CPU asm calls +#include #include +#include u8 inb(u16 port) { @@ -47,6 +49,39 @@ void outl(u16 port, u32 data) __asm__ volatile("outl %0, %1" ::"a"(data), "Nd"(port)); } +void cpuid(int code, u32 *a, u32 *b, u32 *c, u32 *d) +{ + __asm__ volatile("cpuid" : "=a"(*a), "=b"(*b), "=c"(*c), "=d"(*d) : "a"(code)); +} + +char *cpu_string(char buf[12]) +{ + u32 a, b, c, d; + cpuid(CPUID_VENDOR_STRING, &a, &b, &c, &d); + char *ebx = (char *)&b; + char *ecx = (char *)&c; + char *edx = (char *)&d; + buf[0] = ebx[0]; + buf[1] = ebx[1]; + buf[2] = ebx[2]; + buf[3] = ebx[3]; + buf[4] = edx[0]; + buf[5] = edx[1]; + buf[6] = edx[2]; + buf[7] = edx[3]; + buf[8] = ecx[0]; + buf[9] = ecx[1]; + buf[10] = ecx[2]; + buf[11] = ecx[3]; + return buf; +} + +void cpu_print() +{ + char buf[12] = { 0 }; + printf("%s\n", cpu_string(buf)); +} + #ifdef kernel void cli() { -- cgit v1.2.3