mirror of
https://github.com/86Box/86Box.git
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122 lines
2.4 KiB
C
122 lines
2.4 KiB
C
/*
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* 86Box A hypervisor and IBM PC system emulator that specializes in
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* running old operating systems and software designed for IBM
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* PC systems and compatibles from 1981 through fairly recent
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* system designs based on the PCI bus.
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*
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* This file is part of the 86Box distribution.
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*
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* Intel 82815EP SPD Memory Hack
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*
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*
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*
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* Authors: Tiseno100,
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*
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* Copyright 2022 Tiseno100.
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*
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*/
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/* This is a hack because the 86Box SPD calculation algorithm is not made for the 815EP banking.
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This SHOULD ONLY be used with the 815EP chipset. */
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include <stdlib.h>
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#include <wchar.h>
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#include <86box/86box.h>
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#include <86box/device.h>
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#include <86box/mem.h>
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#include <86box/spd.h>
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#define MEM_SIZE_MB (mem_size >> 10)
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uint8_t
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intel_815ep_get_banking()
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{
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switch (MEM_SIZE_MB) {
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case 32:
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return 0x02;
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case 64:
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return 0x01;
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case 96:
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return 0x21;
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case 128:
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return 0x04;
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case 160:
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return 0x24;
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case 192:
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return 0x06;
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case 256:
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return 0x07;
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case 320:
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return 0x57;
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case 384:
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return 0x97;
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case 512:
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return 0xed;
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default:
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return 0;
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}
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}
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void
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intel_815ep_spd_init()
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{
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switch (MEM_SIZE_MB) {
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case 32:
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spd_register(SPD_TYPE_SDRAM, 1, 32);
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break;
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case 64:
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spd_register(SPD_TYPE_SDRAM, 3, 32);
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break;
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case 96:
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spd_register(SPD_TYPE_SDRAM, 7, 32);
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break;
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case 128:
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spd_register(SPD_TYPE_SDRAM, 3, 64);
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break;
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case 160:
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spd_register(SPD_TYPE_SDRAM, 7, 64);
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break;
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case 192:
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spd_register(SPD_TYPE_SDRAM, 3, 96);
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break;
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case 256:
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spd_register(SPD_TYPE_SDRAM, 3, 128);
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break;
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case 320:
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spd_register(SPD_TYPE_SDRAM, 7, 128);
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break;
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case 384:
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spd_register(SPD_TYPE_SDRAM, 7, 128);
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break;
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case 512:
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spd_register(SPD_TYPE_SDRAM, 3, 256);
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break;
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default:
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pclog("Intel 815EP SPD Hack: Illegal Size %dMB\n", MEM_SIZE_MB);
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break;
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}
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}
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