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

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Commit	Line	Data
	1	#include "console.h"
	2	#include <minilib.h>
	3	#include <io.h>
	4	#include <smram.h>
	5	#include <multiboot.h>
	6	#include <smi.h>
	7
	8	#define INFO_SIGNATURE 0x5754454E
	9
	10	extern char _binary_realmode_bin_start[];
	11	extern int _binary_realmode_bin_size;
	12
	13
	14
	15	struct info_section
	16	{
	17	unsigned int signature;
	18	void (*firstrun)();
	19	};
	20
	21	void panic(const char *msg)
	22	{
	23	puts("PANIC: ");
	24	puts(msg);
	25	puts("\nSystem halted\n");
	26	while(1) asm("hlt");
	27	}
	28
	29	void c_start(unsigned int magic, struct mb_info *mbinfo)
	30	{
	31	struct mod_info *mods = mbinfo->mods;
	32	unsigned short grubptr = (unsigned short )0x7CFE;
	33	unsigned char smramc;
	34	int i;
	35
	36	void (realmode)() = (void ()()) 0x4000;
	37
	38	show_cursor();
	39	puts("NetWatch loader\n");
	40
	41	if (magic != MULTIBOOT_LOADER_MAGIC)
	42	panic("Bootloader was not multiboot compliant; cannot continue.");
	43
	44	for (i = 0; i < mbinfo->mod_cnt; i++)
	45	{
	46	puts("Module found:\n");
	47	puts(" Start: "); puthex(mods[i].mod_start); puts("\n");
	48	puts(" Size: "); puthex(mods[i].mod_end - mods[i].mod_start); puts("\n");
	49	puts(" Name: "); puts(mods[i].mod_string); puts("\n");
	50	}
	51
	52	if (mbinfo->mod_cnt != 1)
	53	panic("Expected exactly one module; cannot continue.");
	54
	55	puts("Current USB state is: "); puthex(pci_read16(0, 31, 2, 0xC0)); puts(" "); puthex(pci_read16(0, 31, 4, 0xC0)); puts("\n");
	56	puts("Current SMI state is: "); puthex(inl(0x830)); puts("\n");
	57	puts("Current SMRAMC state is: "); puthex(pci_read8(0, 0, 0, 0x70)); puts("\n");
	58
	59	smi_disable();
	60
	61	/* Try really hard to shut up USB_LEGKEY. */
	62	pci_write16(0, 31, 2, 0xC0, pci_read16(0, 31, 2, 0xC0));
	63	pci_write16(0, 31, 2, 0xC0, 0);
	64	pci_write16(0, 31, 4, 0xC0, pci_read16(0, 31, 4, 0xC0));
	65	pci_write16(0, 31, 4, 0xC0, 0);
	66
	67	/* Open the SMRAM aperture and load our ELF. */
	68	smram_state_t old_smramc = smram_save_state();
	69
	70	if (smram_aseg_set_state(SMRAM_ASEG_OPEN) != 0)
	71	panic("Opening SMRAM failed; cannot load ELF.");
	72
	73	load_elf(mods[0].mod_start, mods[0].mod_end - mods[0].mod_start);
	74
	75	struct info_section * info = (struct info_section *)0x10000;
	76	if (info->signature != INFO_SIGNATURE)
	77	{
	78	smram_restore_state(old_smramc); /* Restore so that video ram is touchable again. */
	79	panic("Info section signature mismatch.");
	80	}
	81
	82	info->firstrun();
	83	smram_restore_state(old_smramc);
	84
	85	puts("Waiting for a bit before returning to real mode...");
	86	for (i=0; i<0x500000; i++)
	87	{
	88	if ((i % 0x100000) == 0)
	89	puts(".");
	90	inb(0x80);
	91	}
	92	puts("\n");
	93
	94	puts("Now returning to real mode.\n");
	95	memcpy(0x4000, _binary_realmode_bin_start, (int)&_binary_realmode_bin_size);
	96	realmode(); // goodbye!
	97	}