diff options
Diffstat (limited to 'src/VBox/Devices/PC/BIOS/pcibios.c')
| -rw-r--r-- | src/VBox/Devices/PC/BIOS/pcibios.c | 423 |
1 files changed, 423 insertions, 0 deletions
diff --git a/src/VBox/Devices/PC/BIOS/pcibios.c b/src/VBox/Devices/PC/BIOS/pcibios.c new file mode 100644 index 00000000..00fff6b1 --- /dev/null +++ b/src/VBox/Devices/PC/BIOS/pcibios.c @@ -0,0 +1,423 @@ +/* $Id: pcibios.c $ */ +/** @file + * PCI BIOS support. + */ + +/* + * Copyright (C) 2004-2022 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#include <stdint.h> +#include <string.h> +#include "biosint.h" +#include "inlines.h" + +#if DEBUG_PCI +# define BX_DEBUG_PCI(...) BX_DEBUG(__VA_ARGS__) +#else +# define BX_DEBUG_PCI(...) +#endif + +/* PCI function codes. */ +enum pci_func { + PCI_BIOS_PRESENT = 0x01, /* PCI BIOS presence check. */ + FIND_PCI_DEVICE = 0x02, /* Find PCI device by ID. */ + FIND_PCI_CLASS_CODE = 0x03, /* Find PCI device by class. */ + GEN_SPECIAL_CYCLE = 0x06, /* Generate special cycle. */ + READ_CONFIG_BYTE = 0x08, /* Read a byte from PCI config space. */ + READ_CONFIG_WORD = 0x09, /* Read a word from PCI config space. */ + READ_CONFIG_DWORD = 0x0A, /* Read a dword from PCI config space. */ + WRITE_CONFIG_BYTE = 0x0B, /* Write a byte to PCI config space. */ + WRITE_CONFIG_WORD = 0x0C, /* Write a word to PCI config space. */ + WRITE_CONFIG_DWORD = 0x0D, /* Write a dword to PCI config space. */ + GET_IRQ_ROUTING = 0x0E, /* Get IRQ routing table. */ + SET_PCI_HW_INT = 0x0F, /* Set PCI hardware interrupt. */ +}; + +enum pci_error { + SUCCESSFUL = 0x00, /* Success. */ + FUNC_NOT_SUPPORTED = 0x81, /* Unsupported function. */ + BAD_VENDOR_ID = 0x83, /* Bad vendor ID (all bits set) passed. */ + DEVICE_NOT_FOUND = 0x86, /* No matching device found. */ + BAD_REGISTER_NUMBER = 0x87, /* Register number out of range. */ + SET_FAILED = 0x88, /* Failed to set PCI interrupt. */ + BUFFER_TOO_SMALL = 0x89 /* Routing table buffer insufficient. */ +}; + +/// @todo merge with system.c +#define AX r.gr.u.r16.ax +#define BX r.gr.u.r16.bx +#define CX r.gr.u.r16.cx +#define DX r.gr.u.r16.dx +#define SI r.gr.u.r16.si +#define DI r.gr.u.r16.di +#define BP r.gr.u.r16.bp +#define SP r.gr.u.r16.sp +#define EAX r.gr.u.r32.eax +#define EBX r.gr.u.r32.ebx +#define ECX r.gr.u.r32.ecx +#define EDX r.gr.u.r32.edx +#define ES r.es + +/* The 16-bit PCI BIOS service must be callable from both real and protected + * mode. In protected mode, the caller must set the CS selector base to F0000h + * (but the CS selector value is not specified!). The caller does not always + * provide a DS which covers the BIOS segment. + * + * Unlike APM, there are no provisions for the 32-bit PCI BIOS interface + * calling the 16-bit implementation. + * + * The PCI Firmware Specification requires that the PCI BIOS service is called + * with at least 1,024 bytes of stack space available, that interrupts are not + * enabled during execution, and that the routines are re-entrant. + * + * Implementation notes: + * - The PCI BIOS interface already uses certain 32-bit registers even in + * 16-bit mode. To simplify matters, all 32-bit GPRs are saved/restored and + * may be used by helper routines (notably for 32-bit port I/O). + */ + +#define PCI_CFG_ADDR 0xCF8 +#define PCI_CFG_DATA 0xCFC + +#ifdef __386__ + +#define PCIxx(x) pci32_##x + +/* The stack layout is different in 32-bit mode. */ +typedef struct { + pushad_regs_t gr; + uint32_t es; + uint32_t flags; +} pci_regs_t; + +#define FLAGS r.flags + +/* In 32-bit mode, don't do any output; not technically impossible but needs + * a lot of extra code. + */ +#undef BX_INFO +#define BX_INFO(...) +#undef BX_DEBUG_PCI +#define BX_DEBUG_PCI(...) + +#else + +#define PCIxx(x) pci16_##x + +typedef struct { + pushad_regs_t gr; + uint16_t ds; + uint16_t es; + iret_addr_t ra; +} pci_regs_t; + +#define FLAGS r.ra.flags.u.r16.flags + +#endif + +#ifdef __386__ + +/* 32-bit code can just use the compiler intrinsics. */ +extern unsigned inpd(unsigned port); +extern unsigned outpd(unsigned port, unsigned value); +#pragma intrinsic(inpd,outpd) + +#else + +/// @todo merge with AHCI code + +/* Warning: Destroys high bits of EAX. */ +uint32_t inpd(uint16_t port); +#pragma aux inpd = \ + ".386" \ + "in eax, dx" \ + "mov dx, ax" \ + "shr eax, 16" \ + "xchg ax, dx" \ + parm [dx] value [dx ax] modify nomemory; + +/* Warning: Destroys high bits of EAX. */ +void outpd(uint16_t port, uint32_t val); +#pragma aux outpd = \ + ".386" \ + "xchg ax, cx" \ + "shl eax, 16" \ + "mov ax, cx" \ + "out dx, eax" \ + parm [dx] [cx ax] modify nomemory; + +#endif + +/* PCI IRQ routing expansion buffer descriptor. */ +typedef struct { + uint16_t buf_size; + uint8_t __far *buf_ptr; +} pci_route_buf; + +/* Defined in assembler module .*/ +extern char pci_routing_table[]; +extern uint16_t pci_routing_table_size; + +/* Write the CONFIG_ADDRESS register to prepare for data access. Requires + * the register offset to be DWORD aligned (low two bits clear). Warning: + * destroys high bits of EAX. + */ +void pci16_w_addr(uint16_t bus_dev_fn, uint16_t ofs, uint16_t cfg_addr); +#pragma aux pci16_w_addr = \ + ".386" \ + "movzx eax, ax" \ + "shl eax, 8" \ + "or eax, 80000000h" \ + "mov al, bl" \ + "out dx, eax" \ + parm [ax] [bx] [dx] modify exact [ax] nomemory; + + +/* Select a PCI configuration register given its offset and bus/dev/fn. + * This is largely a wrapper to avoid excessive inlining. + */ +void PCIxx(select_reg)(uint16_t bus_dev_fn, uint16_t ofs) +{ + pci16_w_addr(bus_dev_fn, ofs & ~3, PCI_CFG_ADDR); +} + +/* Selected configuration space offsets. */ +#define PCI_VEN_ID 0x00 +#define PCI_DEV_ID 0x02 +#define PCI_REV_ID 0x08 +#define PCI_CLASS_CODE 0x09 +#define PCI_HEADER_TYPE 0x0E +#define PCI_BRIDGE_SUBORD 0x1A + +/* To avoid problems with 16-bit code, we reserve the last possible + * bus/dev/fn combination (65,535). Upon reaching this location, the + * probing will end. + */ +#define BUSDEVFN_NOT_FOUND 0xFFFF + +/* In the search algorithm, we decrement the device index every time + * a matching device is found. If the requested device is indeed found, + * the index will have decremented down to -1/0xFFFF. + */ +#define INDEX_DEV_FOUND 0xFFFF + +/* Find a specified PCI device, either by vendor+device ID or class. + * If index is non-zero, the n-th device will be located. When searching + * by class, the ignore_if flag only compares the base and sub-class code, + * ignoring the programming interface code. + * + * Note: This function is somewhat performance critical; since it may + * generate a high number of port I/O accesses, it can take a significant + * amount of time in cases where the caller is looking for a number of + * non-present devices. + */ +uint16_t PCIxx(find_device)(uint32_t search_item, uint16_t index, int search_class, int ignore_if) +{ + uint32_t data; + uint16_t bus_dev_fn; + uint8_t max_bus; + uint8_t hdr_type; + uint8_t subordinate; + int step; + int found; + + if (search_class) { + BX_DEBUG_PCI("PCI: Find class %08lX index %u\n", + search_item, index); + } else + BX_DEBUG_PCI("PCI: Find device %04X:%04X index %u\n", + (uint16_t)search_item, (uint16_t)(search_item >> 16), index); + + bus_dev_fn = 0; /* Start at the beginning. */ + max_bus = 0; /* Initially assume primary bus only. */ + + do { + /* For the first function of a device, read the device's header type. + * If the header type has all bits set, there's no device. A PCI + * multi-function device must implement function 0 and the header type + * will be something other than 0xFF. If the header type has the high + * bit clear, there is a device but it's not multi-function, so we can + * skip probing the next 7 sub-functions. + */ + if ((bus_dev_fn & 7) == 0) { + PCIxx(select_reg)(bus_dev_fn, PCI_HEADER_TYPE); + hdr_type = inp(PCI_CFG_DATA + (PCI_HEADER_TYPE & 3)); + if (hdr_type == 0xFF) { + bus_dev_fn += 8; /* Skip to next device. */ + continue; + } + if (hdr_type & 0x80) + step = 1; /* MFD - try every sub-function. */ + else + step = 8; /* No MFD, go to next device after probing. */ + } + + /* If the header type indicates a bus, we're interested. The secondary + * and subordinate bus numbers will indicate which buses are present; + * thus we can determine the highest bus number. In the common case, + * there will be only the primary bus (i.e. bus 0) and we can avoid + * looking at the remaining 255 theoretically present buses. This check + * only needs to be done on the primary bus, since bridges must report + * all bridges potentially behind them. + */ + if ((hdr_type & 7) == 1 && (bus_dev_fn >> 8) == 0) { + /* Read the subordinate (last) bridge number. */ + PCIxx(select_reg)(bus_dev_fn, PCI_BRIDGE_SUBORD); + subordinate = inp(PCI_CFG_DATA + (PCI_BRIDGE_SUBORD & 3)); + if (subordinate > max_bus) + max_bus = subordinate; + } + + /* Select the appropriate register. */ + PCIxx(select_reg)(bus_dev_fn, search_class ? PCI_REV_ID : PCI_VEN_ID); + data = inpd(PCI_CFG_DATA); + found = 0; + + /* Only 3 or even just 2 bytes are compared for class searches. */ + if (search_class) + if (ignore_if) + data >>= 16; + else + data >>= 8; + +#if 0 + BX_DEBUG_PCI("PCI: Data is %08lX @ %02X:%%02X:%01X\n", data, + bus_dev_fn >> 8, bus_dev_fn >> 3 & 31, bus_dev_fn & 7); +#endif + + if (data == search_item) + found = 1; + + /* If device was found but index is non-zero, decrement index and + * continue looking. If requested device was found, index will be -1! + */ + if (found && !index--) + break; + + bus_dev_fn += step; + } while ((bus_dev_fn >> 8) <= max_bus); + + if (index == INDEX_DEV_FOUND) + BX_DEBUG_PCI("PCI: Device found (%02X:%%02X:%01X)\n", bus_dev_fn >> 8, + bus_dev_fn >> 3 & 31, bus_dev_fn & 7); + + return index == INDEX_DEV_FOUND ? bus_dev_fn : BUSDEVFN_NOT_FOUND; +} + +void BIOSCALL PCIxx(function)(volatile pci_regs_t r) +{ + pci_route_buf __far *route_buf; + uint16_t device; + + BX_DEBUG_PCI("PCI: AX=%04X BX=%04X CX=%04X DI=%04X\n", AX, BX, CX, DI); + + SET_AH(SUCCESSFUL); /* Assume success. */ + CLEAR_CF(); + + switch (GET_AL()) { + case PCI_BIOS_PRESENT: + AX = 0x0001; /* Configuration mechanism #1 supported. */ + BX = 0x0210; /* Version 2.1. */ + /// @todo return true max bus # in CL + CX = 0; /* Maximum bus number. */ + EDX = 'P' | ('C' << 8) | ((uint32_t)'I' << 16) | ((uint32_t)' ' << 24); + break; + case FIND_PCI_DEVICE: + /* Vendor ID FFFFh is reserved so that non-present devices can + * be easily detected. + */ + if (DX == 0xFFFF) { + SET_AH(BAD_VENDOR_ID); + SET_CF(); + } else { + device = PCIxx(find_device)(DX | (uint32_t)CX << 16, SI, 0, 0); + if (device == BUSDEVFN_NOT_FOUND) { + SET_AH(DEVICE_NOT_FOUND); + SET_CF(); + } else { + BX = device; + } + } + break; + case FIND_PCI_CLASS_CODE: + device = PCIxx(find_device)(ECX, SI, 1, 0); + if (device == BUSDEVFN_NOT_FOUND) { + SET_AH(DEVICE_NOT_FOUND); + SET_CF(); + } else { + BX = device; + } + break; + case READ_CONFIG_BYTE: + case READ_CONFIG_WORD: + case READ_CONFIG_DWORD: + case WRITE_CONFIG_BYTE: + case WRITE_CONFIG_WORD: + case WRITE_CONFIG_DWORD: + if (DI >= 256) { + SET_AH(BAD_REGISTER_NUMBER); + SET_CF(); + } else { + PCIxx(select_reg)(BX, DI); + switch (GET_AL()) { + case READ_CONFIG_BYTE: + SET_CL(inp(PCI_CFG_DATA + (DI & 3))); + break; + case READ_CONFIG_WORD: + CX = inpw(PCI_CFG_DATA + (DI & 2)); + break; + case READ_CONFIG_DWORD: + ECX = inpd(PCI_CFG_DATA); + break; + case WRITE_CONFIG_BYTE: + outp(PCI_CFG_DATA + (DI & 3), GET_CL()); + break; + case WRITE_CONFIG_WORD: + outpw(PCI_CFG_DATA + (DI & 2), CX); + break; + case WRITE_CONFIG_DWORD: + outpd(PCI_CFG_DATA, ECX); + break; + } + } + break; + case GET_IRQ_ROUTING: + route_buf = ES :> (void *)DI; + BX_DEBUG_PCI("PCI: Route Buf %04X:%04X size %04X, need %04X (at %04X:%04X)\n", + FP_SEG(route_buf->buf_ptr), FP_OFF(route_buf->buf_ptr), + route_buf->buf_size, pci_routing_table_size, ES, DI); + if (pci_routing_table_size > route_buf->buf_size) { + SET_AH(BUFFER_TOO_SMALL); + SET_CF(); + } else { + rep_movsb(route_buf->buf_ptr, pci_routing_table, pci_routing_table_size); + /* IRQs 9 and 11 are PCI only. */ + BX = (1 << 9) | (1 << 11); + } + route_buf->buf_size = pci_routing_table_size; + break; + default: + BX_INFO("PCI: Unsupported function AX=%04X BX=%04X called\n", AX, BX); + SET_AH(FUNC_NOT_SUPPORTED); + SET_CF(); + } +} |