diff options
Diffstat (limited to 'arch/i386/cpu/cpu.c')
| -rw-r--r-- | arch/i386/cpu/cpu.c | 157 |
1 files changed, 0 insertions, 157 deletions
diff --git a/arch/i386/cpu/cpu.c b/arch/i386/cpu/cpu.c deleted file mode 100644 index 5ca0c91..0000000 --- a/arch/i386/cpu/cpu.c +++ /dev/null @@ -1,157 +0,0 @@ -/* - * (C) Copyright 2008-2011 - * Graeme Russ, <graeme.russ@gmail.com> - * - * (C) Copyright 2002 - * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se> - * - * (C) Copyright 2002 - * Sysgo Real-Time Solutions, GmbH <www.elinos.com> - * Marius Groeger <mgroeger@sysgo.de> - * - * (C) Copyright 2002 - * Sysgo Real-Time Solutions, GmbH <www.elinos.com> - * Alex Zuepke <azu@sysgo.de> - * - * See file CREDITS for list of people who contributed to this - * project. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation; either version 2 of - * the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, - * MA 02111-1307 USA - */ - -#include <common.h> -#include <command.h> -#include <asm/processor.h> -#include <asm/processor-flags.h> -#include <asm/interrupt.h> - -/* - * Constructor for a conventional segment GDT (or LDT) entry - * This is a macro so it can be used in initialisers - */ -#define GDT_ENTRY(flags, base, limit) \ - ((((base) & 0xff000000ULL) << (56-24)) | \ - (((flags) & 0x0000f0ffULL) << 40) | \ - (((limit) & 0x000f0000ULL) << (48-16)) | \ - (((base) & 0x00ffffffULL) << 16) | \ - (((limit) & 0x0000ffffULL))) - -struct gdt_ptr { - u16 len; - u32 ptr; -} __attribute__((packed)); - -static void reload_gdt(void) -{ - /* - * There are machines which are known to not boot with the GDT - * being 8-byte unaligned. Intel recommends 16 byte alignment - */ - static const u64 boot_gdt[] __attribute__((aligned(16))) = { - /* CS: code, read/execute, 4 GB, base 0 */ - [GDT_ENTRY_32BIT_CS] = GDT_ENTRY(0xc09b, 0, 0xfffff), - /* DS: data, read/write, 4 GB, base 0 */ - [GDT_ENTRY_32BIT_DS] = GDT_ENTRY(0xc093, 0, 0xfffff), - /* 16-bit CS: code, read/execute, 64 kB, base 0 */ - [GDT_ENTRY_16BIT_CS] = GDT_ENTRY(0x109b, 0, 0x0ffff), - /* 16-bit DS: data, read/write, 64 kB, base 0 */ - [GDT_ENTRY_16BIT_DS] = GDT_ENTRY(0x1093, 0, 0x0ffff), - }; - static struct gdt_ptr gdt; - - gdt.len = sizeof(boot_gdt)-1; - gdt.ptr = (u32)&boot_gdt; - - asm volatile("lgdtl %0\n" \ - "movl $((2+1)*8), %%ecx\n" \ - "movl %%ecx, %%ds\n" \ - "movl %%ecx, %%es\n" \ - "movl %%ecx, %%fs\n" \ - "movl %%ecx, %%gs\n" \ - "movl %%ecx, %%ss" \ - : : "m" (gdt) : "ecx"); -} - -int x86_cpu_init_f(void) -{ - const u32 em_rst = ~X86_CR0_EM; - const u32 mp_ne_set = X86_CR0_MP | X86_CR0_NE; - - /* initialize FPU, reset EM, set MP and NE */ - asm ("fninit\n" \ - "movl %%cr0, %%eax\n" \ - "andl %0, %%eax\n" \ - "orl %1, %%eax\n" \ - "movl %%eax, %%cr0\n" \ - : : "i" (em_rst), "i" (mp_ne_set) : "eax"); - - return 0; -} -int cpu_init_f(void) __attribute__((weak, alias("x86_cpu_init_f"))); - -int x86_cpu_init_r(void) -{ - const u32 nw_cd_rst = ~(X86_CR0_NW | X86_CR0_CD); - - /* turn on the cache and disable write through */ - asm("movl %%cr0, %%eax\n" - "andl %0, %%eax\n" - "movl %%eax, %%cr0\n" - "wbinvd\n" : : "i" (nw_cd_rst) : "eax"); - - reload_gdt(); - - /* Initialize core interrupt and exception functionality of CPU */ - cpu_init_interrupts (); - return 0; -} -int cpu_init_r(void) __attribute__((weak, alias("x86_cpu_init_r"))); - -int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) -{ - printf ("resetting ...\n"); - - /* wait 50 ms */ - udelay(50000); - disable_interrupts(); - reset_cpu(0); - - /*NOTREACHED*/ - return 0; -} - -void flush_cache (unsigned long dummy1, unsigned long dummy2) -{ - asm("wbinvd\n"); -} - -void __attribute__ ((regparm(0))) generate_gpf(void); - -/* segment 0x70 is an arbitrary segment which does not exist */ -asm(".globl generate_gpf\n" - ".hidden generate_gpf\n" - ".type generate_gpf, @function\n" - "generate_gpf:\n" - "ljmp $0x70, $0x47114711\n"); - -void __reset_cpu(ulong addr) -{ - printf("Resetting using i386 Triple Fault\n"); - set_vector(13, generate_gpf); /* general protection fault handler */ - set_vector(8, generate_gpf); /* double fault handler */ - generate_gpf(); /* start the show */ -} -void reset_cpu(ulong addr) __attribute__((weak, alias("__reset_cpu"))); |