X-Git-Url: http://git.joshuawise.com/netwatch.git/blobdiff_plain/9b8c947be2d07e7c5006a92127e58b6022718cbd..ee681ad4b4f2ace24beb4d401d425573b450bbd7:/grubload/multiboot_c.c

diff --git a/grubload/multiboot_c.c b/grubload/multiboot_c.c
index c87b675..372363c 100644
--- a/grubload/multiboot_c.c
+++ b/grubload/multiboot_c.c
@@ -1,46 +1,99 @@
 #include "console.h"
+#include "loader.h"
+#include <output.h>
+#include <minilib.h>
+#include <io.h>
+#include <smram.h>
+#include <multiboot.h>
+#include <smi.h>
+#include <pci.h>
 
-struct mb_info
+#define INFO_SIGNATURE 0x5754454E
+
+extern char _binary_realmode_bin_start[];
+extern int _binary_realmode_bin_size;
+
+struct info_section
 {
-	unsigned long flags;
-	unsigned long mem_lower, mem_upper;
-	unsigned long boot_dev;
-	char *cmdline;
-	unsigned long mod_cnt;
-	struct mod_info *mods;
+	unsigned int signature;
+	void (*firstrun)();
 };
 
-struct mod_info
+void panic(const char *msg)
 {
-	void *mod_start;
-	void *mod_end;
-	char *mod_string;
-	void *reserved;
-};
+	outputf("PANIC: %s\nSystem halted\n", msg);
+	while(1) { __asm__("hlt"); }
+}
 
-void c_start(unsigned int magic, struct mb_info *wee)
+void c_start(unsigned int magic, struct mb_info *mbinfo)
 {
-	unsigned short *grubptr = 0x7CFE;
+	struct mod_info *mods = mbinfo->mods;
+	smram_state_t old_smramc;
+	struct info_section * info;
 	int i;
 	
-	puts("Magic is: ");
-	puthex(magic);
-	puts("\nMultiboot header is: ");
-	puthex(wee);
-	puts("\n");
+	void (*realmode)() = (void (*)()) 0x4000;
+	
 	show_cursor();
+	outputf("NetWatch loader");
 	
-	puts("Grubptr is: ");
-	puthex(*grubptr);
-	puts("\n");
+	if (magic != MULTIBOOT_LOADER_MAGIC)
+		panic("Bootloader was not multiboot compliant; cannot continue.");
+	
+	for (i = 0; i < mbinfo->mod_cnt; i++)
+	{
+		outputf("Module found:");
+		outputf("  Start: %08x", (unsigned long) mods[i].mod_start);
+		outputf("  Size: %08x", (unsigned long)mods[i].mod_end - (unsigned long)mods[i].mod_start);
+		outputf("  Name: %s", mods[i].mod_string);
+	}
+
+	if (mbinfo->mod_cnt != 1)
+		panic("Expected exactly one module; cannot continue.");
+	outputf("Current SMRAMC state is: %02x", pci_read8(0, 0, 0, 0x70));
+	outputf("Current USB state is: %04x %04x", pci_read16(0, 31, 2, 0xC0), pci_read16(0, 31, 4, 0xC0));
+	outputf("Current SMI state is: %08x", inl(0x830));
+	
+	smi_disable();
 	
-	for (i = 0; i < wee->mod_cnt; i++)
+	/* 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);
+	
+	pci_bus_enum();
+
+	/* Open the SMRAM aperture and load our ELF. */
+	old_smramc = smram_save_state();
+
+	if (smram_aseg_set_state(SMRAM_ASEG_OPEN) != 0)
+		panic("Opening SMRAM failed; cannot load ELF.");
+
+	load_elf(mods[0].mod_start, (unsigned long)mods[0].mod_end - (unsigned long)mods[0].mod_start);
+
+	info = (struct info_section *)0x10000;
+	if (info->signature != INFO_SIGNATURE)
+	{
+		smram_restore_state(old_smramc);		/* Restore so that video ram is touchable again. */
+		panic("Info section signature mismatch.");
+	}
+
+	info->firstrun();
+	smram_restore_state(old_smramc);
+	
+	outputf("New SMRAMC state is: %02x", pci_read8(0, 0, 0, 0x70));
+
+	puts("Waiting for a bit before returning to real mode...");
+	for (i=0; i<0x500000; i++)
 	{
-		puts("Module:\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");
+		if ((i % 0x100000) == 0)
+			puts(".");
+		inb(0x80);
 	}
-	while (1)
-		;
+	puts("\n");
+
+	outputf("Now returning to real mode.");
+	memcpy((void *)0x4000, _binary_realmode_bin_start, (int)&_binary_realmode_bin_size);
+	realmode();	// goodbye!
 }