Joshua Wise's Git repositories - netwatch.git/blame_incremental

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Commit	Line	Data
	1	#include "console.h"
	2	#include <io.h>
	3	#include <smram.h>
	4	#include <multiboot.h>
	5
	6	#define INFO_SIGNATURE 0x5754454E
	7
	8	extern char _binary_realmode_bin_start[];
	9	extern int _binary_realmode_bin_size;
	10
	11
	12
	13	struct info_section
	14	{
	15	unsigned int signature;
	16	void (*firstrun)();
	17	};
	18
	19	void panic(const char *msg)
	20	{
	21	puts("PANIC: ");
	22	puts(msg);
	23	puts("\nSystem halted\n");
	24	while(1) asm("hlt");
	25	}
	26
	27	void c_start(unsigned int magic, struct mb_info *mbinfo)
	28	{
	29	struct mod_info *mods = mbinfo->mods;
	30	unsigned short grubptr = (unsigned short )0x7CFE;
	31	unsigned char smramc;
	32	int i;
	33
	34	void (realmode)() = (void ()()) 0x4000;
	35
	36	show_cursor();
	37	puts("NetWatch loader\n");
	38
	39	if (magic != MULTIBOOT_LOADER_MAGIC)
	40	panic("Bootloader was not multiboot compliant; cannot continue.");
	41
	42	for (i = 0; i < mbinfo->mod_cnt; i++)
	43	{
	44	puts("Module found:\n");
	45	puts(" Start: "); puthex(mods[i].mod_start); puts("\n");
	46	puts(" Size: "); puthex(mods[i].mod_end - mods[i].mod_start); puts("\n");
	47	puts(" Name: "); puts(mods[i].mod_string); puts("\n");
	48	}
	49
	50	if (mbinfo->mod_cnt != 1)
	51	panic("Expected exactly one module; cannot continue.");
	52
	53	puts("Current USB state is: "); puthex(pci_read16(0, 31, 2, 0xC0)); puts(" "); puthex(pci_read16(0, 31, 4, 0xC0)); puts("\n");
	54	puts("Current SMI state is: "); puthex(inl(0x830)); puts("\n");
	55	puts("Current SMRAMC state is: "); puthex(pci_read8(0, 0, 0, 0x70)); puts("\n");
	56
	57	outl(0x830, inl(0x830) & ~0x1); /* turn off SMIs */
	58
	59	/* Try really hard to shut up USB_LEGKEY. */
	60	pci_write16(0, 31, 2, 0xC0, pci_read16(0, 31, 2, 0xC0));
	61	pci_write16(0, 31, 2, 0xC0, 0);
	62	pci_write16(0, 31, 4, 0xC0, pci_read16(0, 31, 4, 0xC0));
	63	pci_write16(0, 31, 4, 0xC0, 0);
	64
	65
	66	/* Open the SMRAM aperture and load our ELF. */
	67	smram_state_t old_smramc = smram_save_state();
	68
	69	if (smram_aseg_set_state(SMRAM_ASEG_OPEN) != 0)
	70	panic("Opening SMRAM failed; cannot load ELF.");
	71
	72	load_elf(mods[0].mod_start, mods[0].mod_end - mods[0].mod_start);
	73
	74	struct info_section * info = (struct info_section *)0x10000;
	75	if (info->signature != INFO_SIGNATURE)
	76	{
	77	smram_restore_state(old_smramc); /* Restore so that video ram is touchable again. */
	78	panic("Info section signature mismatch.");
	79	}
	80
	81	info->firstrun();
	82	smram_restore_state(old_smramc);
	83
	84	puts("Waiting for a bit before returning to real mode...");
	85	for (i=0; i<0x500000; i++)
	86	{
	87	if ((i % 0x100000) == 0)
	88	puts(".");
	89	inb(0x80);
	90	}
	91	puts("\n");
	92
	93	puts("Now returning to real mode.\n");
	94	memcpy(0x4000, _binary_realmode_bin_start, (int)&_binary_realmode_bin_size);
	95	realmode(); // goodbye!
	96	}