X-Git-Url: http://git.joshuawise.com/netwatch.git/blobdiff_plain/d56898ee77b960cfe7f1d75bca2725d9d5337553..99970893290223f2006c3a0c6f34ab9eaf5cb4c9:/grubload/multiboot_c.c

diff --git a/grubload/multiboot_c.c b/grubload/multiboot_c.c
index f871687..572c3fd 100644
--- a/grubload/multiboot_c.c
+++ b/grubload/multiboot_c.c
@@ -1,4 +1,8 @@
 #include "console.h"
+#include <io.h>
+
+extern char _binary_realmode_bin_start[];
+extern int _binary_realmode_bin_size;
 
 struct mb_info
 {
@@ -20,9 +24,12 @@ struct mod_info
 
 void c_start(unsigned int magic, struct mb_info *wee)
 {
-	unsigned short *grubptr = 0x7CFE;
+	unsigned short *grubptr = (unsigned short *)0x7CFE;
+	unsigned char smramc;
 	int i;
 	
+	void (*realmode)() = (void (*)()) 0x4000;
+	
 	puts("Magic is: ");
 	puthex(magic);
 	puts("\nMultiboot header is: ");
@@ -43,15 +50,39 @@ 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");
 
-
-	while (1)
-		;
+	puts("Now returning to real mode.\n");	
+	memcpy(0x4000, _binary_realmode_bin_start, (int)&_binary_realmode_bin_size);
+	realmode();	// goodbye!
 }