Add cut 1 at a TODO list

[netwatch.git] / ich2 / smram-ich2.c

#include "reg-82815.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
};

#ifdef __linux__

void smram_aseg_dump(void) {

	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);

	printf("SMRAMC: %02x\n", smramc);

	tom += memsz[drp & 0xF];
	tom += memsz[drp >> 4];
	tom += memsz[drp2 & 0xF];
	
	printf("Top of DRAM: %08x\n", tom);
	
	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;
	}
}
#endif

int smram_aseg_set_state (int open) {
	unsigned char smramc;
	smramc = pci_read8(0, 0, 0, SMRAMC);

	if (smramc & SMRAMC_LOCK)
	{
		/* SMRAM is locked; can't load anything. */
		return 1;
	}

	if (open) {
		/* Set LSMM to 01 (ABseg = system RAM) */
		smramc = (smramc & 0xF0) | 0x04;
	} else {
		/* Set LSMM to 11 (ABseg = SMM RAM) */
		smramc = (smramc & 0xF0) | 0x0C;
	}

	pci_write8(0, 0, 0, SMRAMC);

	return 0;
}