/* * 86Box A hypervisor and IBM PC system emulator that specializes in * running old operating systems and software designed for IBM * PC systems and compatibles from 1981 through fairly recent * system designs based on the PCI bus. * * This file is part of the 86Box distribution. * * Implementation of the UMC 8886xx PCI to ISA Bridge . * * Note: This chipset has no datasheet, everything were done via * reverse engineering the BIOS of various machines using it. * * * * Authors: Tiseno100, * Miran Grca, * * Copyright 2021 Tiseno100. * Copyright 2021 Miran Grca. */ /* UMC 8886xx Configuration Registers Note: PMU functionality is quite basic. There may be Enable/Disable bits, IRQ/SMI picks and it also required for 386_common.c to get patched in order to function properly. Warning: Register documentation may be inaccurate! UMC 8886xx: (F: Has No Internal IDE / AF or BF: Has Internal IDE) Function 0 Register 43: Bits 7-4 PCI IRQ for INTB Bits 3-0 PCI IRQ for INTA Function 0 Register 44: Bits 7-4 PCI IRQ for INTD Bits 3-0 PCI IRQ for INTC Function 0 Register 46 (corrected by Miran Grca): Bit 7: IRQ SMI Request (1: IRQ 15, 0: IRQ 10) Bit 6: PMU Trigger(1: By IRQ/0: By SMI) Function 0 Register 56: Bit 1-0 ISA Bus Speed 0 0 PCICLK/3 0 1 PCICLK/4 1 0 PCICLK/2 Function 0 Register A2 - non-software SMI# status register (documented by Miran Grca): Bit 4: I set, graphics card goes into sleep mode This register is most likely R/WC Function 0 Register A3 (added more details by Miran Grca): Bit 7: Unlock SMM Bit 6: Software SMI trigger (also doubles as software SMI# status register, cleared by writing a 0 to it - see the handler used by Phoenix BIOS'es): If Function 0 Register 46 Bit 6 is set, it raises the specified IRQ (15 or 10) instead. Function 0 Register A4: Bit 0: Host to PCI Clock (1: 1 by 1/0: 1 by half) Function 1 Register 4: (UMC 8886AF/8886BF Only!) Bit 0: Enable Internal IDE */ #include #include #include #include #include #include #define HAVE_STDARG_H #include <86box/86box.h> #include "cpu.h" #include <86box/timer.h> #include <86box/io.h> #include <86box/device.h> #include <86box/hdd.h> #include <86box/hdc.h> #include <86box/hdc_ide.h> #include <86box/pic.h> #include <86box/pci.h> #include <86box/chipset.h> #define IDE_BIT 0x01 #ifdef ENABLE_UMC_8886_LOG int umc_8886_do_log = ENABLE_UMC_8886_LOG; static void umc_8886_log(const char *fmt, ...) { va_list ap; if (umc_8886_do_log) { va_start(ap, fmt); pclog_ex(fmt, ap); va_end(ap); } } #else # define umc_8886_log(fmt, ...) #endif /* PCI IRQ Flags */ #define INTA (PCI_INTA + (2 * !(addr & 1))) #define INTB (PCI_INTB + (2 * !(addr & 1))) #define IRQRECALCA (((val & 0xf0) != 0) ? ((val & 0xf0) >> 4) : PCI_IRQ_DISABLED) #define IRQRECALCB (((val & 0x0f) != 0) ? (val & 0x0f) : PCI_IRQ_DISABLED) /* Disable Internal IDE Flag needed for the AF or BF Southbridge variant */ #define HAS_IDE dev->has_ide /* Southbridge Revision */ #define SB_ID dev->sb_id typedef struct umc_8886_t { uint8_t max_func; /* Last function number */ uint8_t pci_slot; uint8_t pad; uint8_t pad0; uint8_t pci_conf_sb[2][256]; /* PCI Registers */ uint16_t sb_id; /* Southbridge Revision */ int has_ide; /* Check if Southbridge Revision is AF or F */ } umc_8886_t; static void umc_8886_ide_handler(int status) { ide_pri_disable(); ide_sec_disable(); if (status) { ide_pri_enable(); ide_sec_enable(); } } static void umc_8886_write(int func, int addr, uint8_t val, void *priv) { umc_8886_t *dev = (umc_8886_t *) priv; if (func <= dev->max_func) switch (func) { case 0: /* PCI to ISA Bridge */ umc_8886_log("UM8886: dev->regs[%02x] = %02x POST %02x\n", addr, val, inb(0x80)); switch (addr) { case 0x04: case 0x05: dev->pci_conf_sb[func][addr] = val; break; case 0x07: dev->pci_conf_sb[func][addr] &= ~(val & 0xf9); break; case 0x0c: case 0x0d: dev->pci_conf_sb[func][addr] = val; break; case 0x40: case 0x41: case 0x42: dev->pci_conf_sb[func][addr] = val; break; case 0x43: case 0x44: dev->pci_conf_sb[func][addr] = val; pci_set_irq_routing(INTA, IRQRECALCA); pci_set_irq_routing(INTB, IRQRECALCB); break; case 0x45: dev->pci_conf_sb[func][addr] = val; break; case 0x46: /* Bit 6 seems to be the IRQ/SMI# toggle, 1 = IRQ, 0 = SMI#. */ dev->pci_conf_sb[func][addr] = val; break; case 0x47: dev->pci_conf_sb[func][addr] = val; break; case 0x50: case 0x51: case 0x52: case 0x53: case 0x54: case 0x55: dev->pci_conf_sb[func][addr] = val; break; case 0x56: dev->pci_conf_sb[func][addr] = val; switch (val & 3) { case 0: cpu_set_isa_pci_div(3); break; case 1: cpu_set_isa_pci_div(4); break; case 2: cpu_set_isa_pci_div(2); break; default: break; } break; case 0x57: case 0x70 ... 0x76: case 0x80: case 0x81: case 0x90 ... 0x92: case 0xa0 ... 0xa1: dev->pci_conf_sb[func][addr] = val; break; case 0xa2: dev->pci_conf_sb[func][addr] &= ~val; break; case 0xa3: /* SMI Provocation (Bit 7 Enable SMM + Bit 6 Software SMI) */ if (((val & 0xc0) == 0xc0) && !(dev->pci_conf_sb[0][0xa3] & 0x40)) { if (dev->pci_conf_sb[0][0x46] & 0x40) picint(1 << ((dev->pci_conf_sb[0][0x46] & 0x80) ? 15 : 10)); else smi_raise(); dev->pci_conf_sb[0][0xa3] |= 0x04; } dev->pci_conf_sb[func][addr] = val; break; case 0xa4: dev->pci_conf_sb[func][addr] = val; cpu_set_pci_speed(cpu_busspeed / ((val & 1) ? 1 : 2)); break; case 0xa5 ... 0xa8: dev->pci_conf_sb[func][addr] = val; break; default: break; } break; case 1: /* IDE Controller */ umc_8886_log("UM8886-IDE: dev->regs[%02x] = %02x POST: %02x\n", addr, val, inb(0x80)); switch (addr) { case 0x04: dev->pci_conf_sb[func][addr] = val; umc_8886_ide_handler(val & 1); break; case 0x07: dev->pci_conf_sb[func][addr] &= ~(val & 0xf9); break; case 0x3c: case 0x40: case 0x41: dev->pci_conf_sb[func][addr] = val; break; default: break; } break; default: break; } } static uint8_t umc_8886_read(int func, int addr, void *priv) { const umc_8886_t *dev = (umc_8886_t *) priv; uint8_t ret = 0xff; if (func <= dev->max_func) ret = dev->pci_conf_sb[func][addr]; return ret; } static void umc_8886_reset(void *priv) { umc_8886_t *dev = (umc_8886_t *) priv; memset(dev->pci_conf_sb[0], 0x00, sizeof(dev->pci_conf_sb[0])); memset(dev->pci_conf_sb[1], 0x00, sizeof(dev->pci_conf_sb[1])); dev->pci_conf_sb[0][0] = 0x60; /* UMC */ dev->pci_conf_sb[0][1] = 0x10; dev->pci_conf_sb[0][2] = (SB_ID & 0xff); /* 8886xx */ dev->pci_conf_sb[0][3] = ((SB_ID >> 8) & 0xff); dev->pci_conf_sb[0][4] = 0x0f; dev->pci_conf_sb[0][7] = 2; dev->pci_conf_sb[0][8] = 0x0e; dev->pci_conf_sb[0][0x09] = 0x00; dev->pci_conf_sb[0][0x0a] = 0x01; dev->pci_conf_sb[0][0x0b] = 0x06; dev->pci_conf_sb[0][0x40] = 1; dev->pci_conf_sb[0][0x41] = 6; dev->pci_conf_sb[0][0x42] = 8; dev->pci_conf_sb[0][0x43] = 0x9a; dev->pci_conf_sb[0][0x44] = 0xbc; dev->pci_conf_sb[0][0x45] = 4; dev->pci_conf_sb[0][0x47] = 0x40; dev->pci_conf_sb[0][0x50] = 1; dev->pci_conf_sb[0][0x51] = 3; dev->pci_conf_sb[0][0xa8] = 0x20; if (HAS_IDE) { dev->pci_conf_sb[1][0] = 0x60; /* UMC */ dev->pci_conf_sb[1][1] = 0x10; dev->pci_conf_sb[1][2] = 0x3a; /* 8886BF IDE */ dev->pci_conf_sb[1][3] = 0x67; dev->pci_conf_sb[1][4] = 1; /* Start with Internal IDE Enabled */ dev->pci_conf_sb[1][8] = 0x10; dev->pci_conf_sb[1][0x09] = 0x0f; dev->pci_conf_sb[1][0x0a] = dev->pci_conf_sb[1][0x0b] = 1; umc_8886_ide_handler(1); } for (uint8_t i = 1; i < 5; i++) /* Disable all IRQ interrupts */ pci_set_irq_routing(i, PCI_IRQ_DISABLED); cpu_set_isa_pci_div(3); cpu_set_pci_speed(cpu_busspeed / 2); } static void umc_8886_close(void *priv) { umc_8886_t *dev = (umc_8886_t *) priv; free(dev); } static void * umc_8886_init(const device_t *info) { umc_8886_t *dev = (umc_8886_t *) malloc(sizeof(umc_8886_t)); memset(dev, 0, sizeof(umc_8886_t)); dev->has_ide = !!(info->local == 0x886a); pci_add_card(PCI_ADD_SOUTHBRIDGE, umc_8886_read, umc_8886_write, dev, &dev->pci_slot); /* Device 12: UMC 8886xx */ /* Add IDE if UM8886AF variant */ if (HAS_IDE) device_add(&ide_pci_2ch_device); dev->max_func = (HAS_IDE) ? 1 : 0; /* Get the Southbridge Revision */ SB_ID = info->local; umc_8886_reset(dev); return dev; } const device_t umc_8886f_device = { .name = "UMC 8886F", .internal_name = "umc_8886f", .flags = DEVICE_PCI, .local = 0x8886, .init = umc_8886_init, .close = umc_8886_close, .reset = umc_8886_reset, { .available = NULL }, .speed_changed = NULL, .force_redraw = NULL, .config = NULL }; const device_t umc_8886af_device = { .name = "UMC 8886AF/8886BF", .internal_name = "umc_8886af", .flags = DEVICE_PCI, .local = 0x886a, .init = umc_8886_init, .close = umc_8886_close, .reset = umc_8886_reset, { .available = NULL }, .speed_changed = NULL, .force_redraw = NULL, .config = NULL };