From 60a917ef0909a3d22904e8204a0df64094af6e50 Mon Sep 17 00:00:00 2001 From: Joshua Wise Date: Wed, 10 Sep 2008 21:44:55 -0400 Subject: [PATCH 1/1] Load into SMRAM, not just video RAM. --- grubload/Makefile | 2 +- grubload/multiboot_c.c | 30 ++++++++++++++++++++++++++++-- 2 files changed, 29 insertions(+), 3 deletions(-) diff --git a/grubload/Makefile b/grubload/Makefile index f0f9742..572bc53 100644 --- a/grubload/Makefile +++ b/grubload/Makefile @@ -1,4 +1,4 @@ -OBJS=multiboot_c.o multiboot_asm.o console.o minilib.o realmode.o loader.o +OBJS=multiboot_c.o multiboot_asm.o console.o minilib.o realmode.o loader.o ../pci/pci-smm.o CC=gcc CFLAGS=-nostdlib -I../include -I. -fno-builtin -nostdinc diff --git a/grubload/multiboot_c.c b/grubload/multiboot_c.c index 03e2143..ad421b4 100644 --- a/grubload/multiboot_c.c +++ b/grubload/multiboot_c.c @@ -1,4 +1,5 @@ #include "console.h" +#include extern char _binary_realmode_bin_start[]; extern int _binary_realmode_bin_size; @@ -24,6 +25,7 @@ struct mod_info void c_start(unsigned int magic, struct mb_info *wee) { unsigned short *grubptr = 0x7CFE; + unsigned char smramc; int i; void (*realmode)() = 0x4000; @@ -48,13 +50,37 @@ void c_start(unsigned int magic, struct mb_info *wee) puts(" Name: "); puts(wee->mods[i].mod_string); puts("\n"); } - if ((wee->mod_cnt != 1) || (strcmp(wee->mods[0].mod_string, "aseg.elf"))) + if (wee->mod_cnt != 1) { - puts("Expected 1 module called aseg.elf.\n"); + puts("Expected exactly one module; cannot continue.\n"); while(1) asm("hlt"); } + puts("Current USB state is: "); puthex(pci_read16(0, 31, 2, 0xC0)); puts(" "); puthex(pci_read16(0, 31, 4, 0xC0)); puts("\n"); + puts("Current SMI state is: "); puthex(inl(0x830)); puts("\n"); + puts("Current SMRAMC state is: "); puthex(pci_read8(0, 0, 0, 0x70)); puts("\n"); + + outl(0x830, inl(0x830) & ~0x2001); /* turn off SMIs */ + + /* Try really hard to shut up USB_LEGKEY. */ + pci_write16(0, 31, 2, 0xC0, pci_read16(0, 31, 2, 0xC0)); + pci_write16(0, 31, 2, 0xC0, 0); + pci_write16(0, 31, 4, 0xC0, pci_read16(0, 31, 4, 0xC0)); + pci_write16(0, 31, 4, 0xC0, 0); + smramc = pci_read8(0, 0, 0, 0x70); + pci_write8(0, 0, 0, 0x70, (smramc & 0xF0) | 0x04); load_elf(wee->mods[0].mod_start, wee->mods[0].mod_end - wee->mods[0].mod_start); + pci_write8(0, 0, 0, 0x70, smramc); + outb(0x830, inb(0x830) | 0x41); /* turn on the SMIs we want */ + + puts("Waiting for a bit before returning to real mode..."); + for (i=0; i<0x500000; i++) + { + if ((i % 0x100000) == 0) + puts("."); + inb(0x80); + } + puts("\n"); puts("Now returning to real mode.\n"); memcpy(0x4000, _binary_realmode_bin_start, (int)&_binary_realmode_bin_size); -- 2.43.0