Allow arbitrary setup on ich2

[netwatch.git] / ich2 / smm-open-ich2.c

#include "reg-82815.h"
#include <stdlib.h>

unsigned long memsz[] = {
	0,			// 0
	32*1024*1024,		// 1
	32*1024*1024,		// 2
	48*1024*1024,		// 3
	64*1024*1024,		// 4
	64*1024*1024,		// 5
	96*1024*1024,		// 6
	128*1024*1024,		// 7
	128*1024*1024,		// 8
	128*1024*1024,		// 9
	128*1024*1024,		// A
	192*1024*1024,		// B
	256*1024*1024,		// C
	256*1024*1024,		// D
	256*1024*1024,		// E
	512*1024*1024		// F
};

int main(int argc, char **argv)
{
	unsigned char smramc, drp, drp2;
	unsigned int tom = 0;
	int usmm, lsmm;
	
	smramc = pci_read8(0, 0, 0, SMRAMC);
	drp = pci_read8(0, 0, 0, DRP);
	drp2 = pci_read8(0, 0, 0, DRP2);
	
	tom += memsz[drp & 0xF];
	tom += memsz[drp >> 4];
	tom += memsz[drp2 & 0xF];
	
	printf("Top of DRAM: %08x\n", tom);
	
	printf("SMRAMC: %02x\n", smramc);
	if (smramc & SMRAMC_LOCK)
	{
		printf("SMRAM is locked, cannot load anything :-(\n");
		return 1;
	}
	
	usmm = (smramc >> 4) & 0x3;
	lsmm = (smramc >> 2) & 0x3;
	
	switch (usmm)
	{
	case 0:
		printf("TSEG and HSEG both off\n");
		break;
	case 1:
		printf("TSEG off, HSEG %s\n", lsmm ? "off" : "on");
		break;
	case 2:
		printf("TSEG 512KB (%08x - %08x), HSEG %s\n", tom - 512 * 1024, tom - 1, lsmm ? "off" : "on");
		break;
	case 3:
		printf("TSEG 1MB (%08x - %08x), HSEG %s\n", tom - 1 * 1024 * 1024, tom - 1, lsmm ? "off" : "on");
		break;
	}
	
	switch (lsmm)
	{
	case 0:
		printf("ABSEG disabled\n");
		break;
	case 1:
		printf("ABSEG enabled as system RAM\n");
		break;
	case 2:
		printf("ABSEG enabled for SMM code only\n");
		break;
	case 3:
		printf("ABSEG enabled for both SMM code and data\n");
		break;
	}
	
	
	if (argc < 2)
	{
		smramc &= 0xC0;
		smramc |= 0x04;
	
		pci_write8(0, 0, 0, SMRAMC, smramc);
		printf("With any luck, ABSEG is now enabled as system RAM... enjoy!\n");
	} else {
		smramc = strtoul(argv[1], 0, 0);
		
		pci_write8(0, 0, 0, SMRAMC, smramc);
		printf("OK, set it up as you like.\n");
	}
	
	return 0;
}