X-Git-Url: http://git.joshuawise.com/netwatch.git/blobdiff_plain/4122ee13ba211a913b04906c39e72e512cb15c08..c34aba053b84fc15e91e96e04291d911bcd2adb0:/grubload/multiboot_c.c diff --git a/grubload/multiboot_c.c b/grubload/multiboot_c.c index 990ffc6..c75e830 100644 --- a/grubload/multiboot_c.c +++ b/grubload/multiboot_c.c @@ -1,5 +1,6 @@ #include "console.h" #include +#include extern char _binary_realmode_bin_start[]; extern int _binary_realmode_bin_size; @@ -22,8 +23,9 @@ struct mod_info void *reserved; }; -void c_start(unsigned int magic, struct mb_info *wee) +void c_start(unsigned int magic, struct mb_info *info) { + struct mod_info *mods = mods; unsigned short *grubptr = (unsigned short *)0x7CFE; unsigned char smramc; int i; @@ -39,15 +41,15 @@ void c_start(unsigned int magic, struct mb_info *wee) while(1) asm("hlt"); } - for (i = 0; i < wee->mod_cnt; i++) + for (i = 0; i < info->mod_cnt; i++) { puts("Module found:\n"); - puts(" Start: "); puthex(wee->mods[i].mod_start); puts("\n"); - puts(" Size: "); puthex(wee->mods[i].mod_end - wee->mods[i].mod_start); puts("\n"); - puts(" Name: "); puts(wee->mods[i].mod_string); puts("\n"); + puts(" Start: "); puthex(mods[i].mod_start); puts("\n"); + puts(" Size: "); puthex(mods[i].mod_end - mods[i].mod_start); puts("\n"); + puts(" Name: "); puts(mods[i].mod_string); puts("\n"); } - if (wee->mod_cnt != 1) + if (info->mod_cnt != 1) { puts("Expected exactly one module; cannot continue.\n"); while(1) asm("hlt"); @@ -64,10 +66,21 @@ void c_start(unsigned int magic, struct mb_info *wee) 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); + + + /* Open the SMRAM aperture and load our ELF. */ + smram_state_t old_smramc = smram_save_state(); + + if (smram_aseg_set_state(SMRAM_ASEG_OPEN) != 0) + { + puts("Opening SMRAM failed; cannot load ELF.\n"); + } + else + { + load_elf(mods[0].mod_start, mods[0].mod_end - mods[0].mod_start); + smram_restore_state(old_smramc); + } + outb(0x830, inb(0x830) | 0x41); /* turn on the SMIs we want */ puts("Waiting for a bit before returning to real mode...");