| 1 | /* $Id: pciutil.c 82968 2020-02-04 10:35:17Z vboxsync $ */
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| 2 | /** @file
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| 3 | * Utility routines for calling the PCI BIOS.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2011-2020 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | */
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| 17 |
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| 18 | #include <stdint.h>
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| 19 | #include <string.h>
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| 20 | #include "biosint.h"
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| 21 | #include "inlines.h"
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| 22 |
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| 23 | /** PCI BIOS functions. */
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| 24 | #define PCIBIOS_ID 0xb1
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| 25 | #define PCIBIOS_PCI_BIOS_PRESENT 0x01
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| 26 | #define PCIBIOS_FIND_PCI_DEVICE 0x02
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| 27 | #define PCIBIOS_FIND_CLASS_CODE 0x03
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| 28 | #define PCIBIOS_GENERATE_SPECIAL_CYCLE 0x06
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| 29 | #define PCIBIOS_READ_CONFIG_BYTE 0x08
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| 30 | #define PCIBIOS_READ_CONFIG_WORD 0x09
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| 31 | #define PCIBIOS_READ_CONFIG_DWORD 0x0a
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| 32 | #define PCIBIOS_WRITE_CONFIG_BYTE 0x0b
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| 33 | #define PCIBIOS_WRITE_CONFIG_WORD 0x0c
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| 34 | #define PCIBIOS_WRITE_CONFIG_DWORD 0x0d
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| 35 | #define PCIBIOS_GET_IRQ_ROUTING_OPTIONS 0x0e
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| 36 | #define PCIBIOS_SET_PCI_IRQ 0x0f
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| 37 |
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| 38 | /** Status codes. */
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| 39 | #define SUCCESSFUL 0x00
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| 40 | #define FUNC_NOT_SUPPORTED 0x81
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| 41 | #define BAD_VENDOR_ID 0x83
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| 42 | #define DEVICE_NOT_FOUND 0x86
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| 43 | #define BAD_REGISTER_NUMBER 0x87
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| 44 | #define SET_FAILED 0x88
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| 45 | #define BUFFER_TOO_SMALL 0x89
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| 46 |
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| 47 |
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| 48 | #if VBOX_BIOS_CPU >= 80386
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| 49 | /* Warning: Destroys high bits of ECX. */
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| 50 | uint16_t pci_find_class(uint16_t op, uint32_t dev_class, uint16_t index);
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| 51 | # pragma aux pci_find_class = \
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| 52 | ".386" \
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| 53 | "shl ecx, 16" \
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| 54 | "mov cx, dx" \
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| 55 | "int 0x1a" \
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| 56 | "cmp ah, 0" \
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| 57 | "je found" \
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| 58 | "mov bx, 0xffff" \
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| 59 | "found:" \
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| 60 | parm [ax] [cx dx] [si] value [bx];
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| 61 | #endif
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| 62 |
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| 63 | uint16_t pci_find_dev(uint16_t op, uint16_t dev_id, uint16_t ven_id, uint16_t index);
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| 64 | #pragma aux pci_find_dev = \
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| 65 | "int 0x1a" \
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| 66 | "cmp ah, 0" \
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| 67 | "je found" \
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| 68 | "mov bx, 0xffff" \
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| 69 | "found:" \
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| 70 | parm [ax] [cx] [dx] [si] value [bx];
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| 71 |
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| 72 | uint8_t pci_read_cfgb(uint16_t op, uint16_t bus_dev_fn, uint16_t reg);
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| 73 | #pragma aux pci_read_cfgb = \
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| 74 | "int 0x1a" \
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| 75 | parm [ax] [bx] [di] value [cl];
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| 76 |
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| 77 | uint16_t pci_read_cfgw(uint16_t op, uint16_t bus_dev_fn, uint16_t reg);
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| 78 | #pragma aux pci_read_cfgw = \
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| 79 | "int 0x1a" \
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| 80 | parm [ax] [bx] [di] value [cx];
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| 81 |
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| 82 | #if VBOX_BIOS_CPU >= 80386
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| 83 | /* Warning: Destroys high bits of ECX. */
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| 84 | uint32_t pci_read_cfgd(uint16_t op, uint16_t bus_dev_fn, uint16_t reg);
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| 85 | # pragma aux pci_read_cfgd = \
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| 86 | ".386" \
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| 87 | "int 0x1a" \
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| 88 | "mov ax, cx" \
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| 89 | "shr ecx, 16" \
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| 90 | parm [ax] [bx] [di] value [cx ax];
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| 91 | #endif
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| 92 |
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| 93 | uint8_t pci_write_cfgb(uint16_t op, uint16_t bus_dev_fn, uint16_t reg, uint8_t val);
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| 94 | #pragma aux pci_write_cfgb = \
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| 95 | "int 0x1a" \
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| 96 | parm [ax] [bx] [di] [cl];
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| 97 |
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| 98 | uint8_t pci_write_cfgw(uint16_t op, uint16_t bus_dev_fn, uint16_t reg, uint16_t val);
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| 99 | #pragma aux pci_write_cfgw = \
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| 100 | "int 0x1a" \
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| 101 | parm [ax] [bx] [di] [cx];
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| 102 |
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| 103 | #if VBOX_BIOS_CPU >= 80386
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| 104 | /* Warning: Destroys high bits of ECX. */
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| 105 | uint8_t pci_write_cfgd(uint16_t op, uint16_t bus_dev_fn, uint16_t reg, uint32_t val);
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| 106 | # pragma aux pci_write_cfgd = \
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| 107 | ".386" \
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| 108 | "shl ecx, 16" \
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| 109 | "mov cx, dx" \
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| 110 | "int 0x1a" \
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| 111 | parm [ax] [bx] [di] [cx dx];
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| 112 | #endif
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| 113 |
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| 114 |
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| 115 | /**
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| 116 | * Returns the bus/device/function of a PCI device with
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| 117 | * the given class code.
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| 118 | *
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| 119 | * @returns bus/device/fn in a 16-bit integer where
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| 120 | * where the upper byte contains the bus number
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| 121 | * and lower one the device and function number.
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| 122 | * 0xffff if no device was found.
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| 123 | * @param dev_class The PCI class code to search for.
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| 124 | */
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| 125 | uint16_t pci_find_classcode(uint32_t dev_class)
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| 126 | {
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| 127 | #if VBOX_BIOS_CPU >= 80386
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| 128 | return pci_find_class((PCIBIOS_ID << 8) | PCIBIOS_FIND_CLASS_CODE, dev_class, 0);
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| 129 | #else
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| 130 | return UINT16_C(0xffff);
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| 131 | #endif
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| 132 | }
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| 133 |
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| 134 | /**
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| 135 | * Returns the bus/device/function of a PCI device with
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| 136 | * the given base and sub-class code, ignoring the programming interface
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| 137 | * code.
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| 138 | *
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| 139 | * @returns bus/device/fn in a 16-bit integer where
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| 140 | * where the upper byte contains the bus number
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| 141 | * and lower one the device and function number.
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| 142 | * 0xffff if no device was found.
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| 143 | * @param dev_class The PCI class code to search for.
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| 144 | */
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| 145 | uint16_t pci_find_class_noif(uint16_t dev_class)
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| 146 | {
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| 147 | #if VBOX_BIOS_CPU >= 80386
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| 148 | /* Internal call, not an interrupt service! */
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| 149 | return pci16_find_device(dev_class, 0 /*index*/, 1 /*search class*/, 1 /*ignore prog if*/);
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| 150 | #else
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| 151 | return UINT16_C(0xffff);
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| 152 | #endif
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| 153 | }
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| 154 |
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| 155 | /**
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| 156 | * Returns the bus/device/function of a PCI device with
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| 157 | * the given vendor and device id.
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| 158 | *
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| 159 | * @returns bus/device/fn in one 16bit integer where
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| 160 | * where the upper byte contains the bus number
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| 161 | * and lower one the device and function number.
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| 162 | * 0xffff if no device was found.
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| 163 | * @param v_id The vendor ID.
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| 164 | * @param d_id The device ID.
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| 165 | */
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| 166 | uint16_t pci_find_device(uint16_t v_id, uint16_t d_id)
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| 167 | {
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| 168 | return pci_find_dev((PCIBIOS_ID << 8) | PCIBIOS_FIND_PCI_DEVICE, d_id, v_id, 0);
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| 169 | }
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| 170 |
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| 171 | uint32_t pci_read_config_byte(uint8_t bus, uint8_t dev_fn, uint8_t reg)
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| 172 | {
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| 173 | return pci_read_cfgb((PCIBIOS_ID << 8) | PCIBIOS_READ_CONFIG_BYTE, (bus << 8) | dev_fn, reg);
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| 174 | }
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| 175 |
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| 176 | uint32_t pci_read_config_word(uint8_t bus, uint8_t dev_fn, uint8_t reg)
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| 177 | {
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| 178 | return pci_read_cfgw((PCIBIOS_ID << 8) | PCIBIOS_READ_CONFIG_WORD, (bus << 8) | dev_fn, reg);
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| 179 | }
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| 180 |
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| 181 | uint32_t pci_read_config_dword(uint8_t bus, uint8_t dev_fn, uint8_t reg)
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| 182 | {
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| 183 | #if VBOX_BIOS_CPU >= 80386
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| 184 | return pci_read_cfgd((PCIBIOS_ID << 8) | PCIBIOS_READ_CONFIG_DWORD, (bus << 8) | dev_fn, reg);
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| 185 | #else
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| 186 | return pci_read_cfgw((PCIBIOS_ID << 8) | PCIBIOS_READ_CONFIG_WORD, (bus << 8) | dev_fn, reg)
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| 187 | || ((uint32_t)pci_read_cfgw((PCIBIOS_ID << 8) | PCIBIOS_READ_CONFIG_WORD, (bus << 8) | dev_fn, reg + 2) << 16);
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| 188 | #endif
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| 189 | }
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| 190 |
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| 191 | void pci_write_config_word(uint8_t bus, uint8_t dev_fn, uint8_t reg, uint16_t val)
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| 192 | {
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| 193 | pci_write_cfgw((PCIBIOS_ID << 8) | PCIBIOS_WRITE_CONFIG_WORD, (bus << 8) | dev_fn, reg, val);
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| 194 | }
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| 195 |
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| 196 | void pci_write_config_byte(uint8_t bus, uint8_t dev_fn, uint8_t reg, uint8_t val)
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| 197 | {
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| 198 | pci_write_cfgb((PCIBIOS_ID << 8) | PCIBIOS_WRITE_CONFIG_BYTE, (bus << 8) | dev_fn, reg, val);
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| 199 | }
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| 200 |
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| 201 | void pci_write_config_dword(uint8_t bus, uint8_t dev_fn, uint8_t reg, uint32_t val)
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| 202 | {
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| 203 | #if VBOX_BIOS_CPU >= 80386
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| 204 | pci_write_cfgd((PCIBIOS_ID << 8) | PCIBIOS_WRITE_CONFIG_DWORD, (bus << 8) | dev_fn, reg, val);
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| 205 | #else
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| 206 | pci_write_cfgw((PCIBIOS_ID << 8) | PCIBIOS_WRITE_CONFIG_WORD, (bus << 8) | dev_fn, reg, val & 0xffff);
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| 207 | pci_write_cfgw((PCIBIOS_ID << 8) | PCIBIOS_WRITE_CONFIG_WORD, (bus << 8) | dev_fn, reg + 2, val >> 16);
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| 208 | #endif
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| 209 | }
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| 210 |
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