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pcireg: Use DPMI for re-enabling 32-bit support

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This commit is contained in:
RichardG867
2023-05-03 19:14:52 -03:00
parent 18fdf97ed1
commit e9d2c8fccd
4 changed files with 86 additions and 37 deletions
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5
clib/clib.h
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@@ -36,8 +36,11 @@
#endif
/* Platform-specific macros. */
#ifndef __POSIX_UEFI__
#ifdef __POSIX_UEFI__
# define FOPEN_BINARY
#else
# define FMT_FLOAT_SUPPORTED 1
# define FOPEN_BINARY "b"
#endif
#if !defined(__WATCOMC__) || defined(M_I386)
# define IS_32BIT 1

4
clib/watcom.mk
View File

@@ -40,8 +40,12 @@ CC = wcc
CP437_CONV = y
!else
CC = wcc386
!if "$(SYSTEM)" == "PMODEW"
CP437_CONV = y
!else
CP437_CONV = n
!endif
!endif
LINK = wlink
# Establish target C flags.

2
pcireg/Makefile
View File

@@ -15,7 +15,7 @@
# Copyright 2021 RichardG.
#
SYSTEM = DOS
SYSTEM = PMODEW
OBJS = pcireg.obj clib_pci.obj clib_std.obj clib_sys.obj clib_term.obj
DEST = PCIREG.EXE

112
pcireg/pcireg.c
View File

@@ -30,6 +30,7 @@
# include <stdlib.h>
# ifdef __WATCOMC__
# include <dos.h>
# include <i86.h>
# endif
#endif
#include "clib_pci.h"
@@ -82,11 +83,18 @@ static const char *devsel[] = {
static int term_width;
static FILE *pciids_f = NULL;
#if defined(__WATCOMC__) && !defined(M_I386)
static union REGPACK rp;
#if defined(__WATCOMC__)
static union REGS regs;
static struct SREGS seg_regs;
# pragma pack(push, 1)
static struct PACKED {
uint32_t edi, esi, ebp, unused, ebx, edx, ecx, eax;
uint16_t flags, es, ds, fs, gs, ip, cs, sp, ss;
} dpmi_regs;
# pragma pack(pop)
#endif
#pragma pack(push, 0)
#pragma pack(push, 1)
static struct PACKED {
uint32_t device_db_offset,
subdevice_db_offset,
@@ -126,7 +134,7 @@ static struct PACKED {
uint32_t string_offset;
} pciids_progif;
#if defined(__WATCOMC__) && !defined(M_I386)
#if defined(__WATCOMC__)
typedef struct {
uint8_t bus, dev;
struct {
@@ -138,7 +146,9 @@ typedef struct {
typedef struct {
uint16_t len;
union {
void far *data_ptr;
struct {
uint16_t offset, segment;
} data_ptr;
irq_routing_entry_t entry[1];
};
} irq_routing_table_t;
@@ -153,7 +163,7 @@ pciids_open_database()
return 0;
/* Open file, and stop if the open failed or the header couldn't be read. */
pciids_f = fopen("PCIIDS.BIN", "rb");
pciids_f = fopen("PCIIDS.BIN", "r" FOPEN_BINARY);
if (pciids_f && (fread(&pciids_header, sizeof(pciids_header), 1, pciids_f) < 1)) {
fclose(pciids_f);
pciids_f = NULL;
@@ -972,7 +982,7 @@ dump_info(uint8_t bus, uint8_t dev, uint8_t func)
return 0;
}
#if defined(__WATCOMC__) && !defined(M_I386)
#if defined(__WATCOMC__)
static int
comp_irq_routing_entry(const void *elem1, const void *elem2)
{
@@ -981,52 +991,82 @@ comp_irq_routing_entry(const void *elem1, const void *elem2)
return comp_ui8(&a->dev, &b->dev);
}
static int
free_realmode(uint16_t segment)
{
memset(&regs, 0, sizeof(regs));
regs.w.ax = 0x0101;
regs.w.dx = segment;
int386(0x31, &regs, &regs);
return !regs.w.cflag;
}
static int
dump_steering_table(char mode)
{
int i, j, entries;
uint8_t irq_bitmap[256], temp[4];
uint16_t buf_size = 1024, dev_class;
irq_routing_table_t *table;
irq_routing_entry_t *entry;
int i, j, entries;
uint8_t irq_bitmap[256], temp[4];
uint16_t buf_size = 1024, table_segment, dev_class;
irq_routing_table_t far *table;
irq_routing_entry_t far *entry;
uint32_t ttt;
/* Allocate buffer for PCI BIOS. */
/* Allocate real mode memory buffer for PCI BIOS. */
retry_buf:
table = malloc(buf_size);
if (!table) {
printf("Failed to allocate %d bytes.\n", buf_size);
memset(&regs, 0, sizeof(regs));
regs.w.ax = 0x0100;
regs.w.bx = (buf_size + 15) >> 4;
int386(0x31, &regs, &regs);
if (regs.w.cflag) {
printf("Failed to allocate %d bytes. (AX=%04X)\n", (buf_size + 15) & ~0xf, regs.w.ax);
return 1;
}
table_segment = regs.w.ax;
table = (irq_routing_table_t far *) MK_FP(regs.w.dx, 0);
/* Specify where the IRQ routing information will be placed. */
table->len = buf_size;
table->data_ptr.segment = table_segment;
table->data_ptr.offset = 2; /* hardcoded! */
/* Call PCI BIOS to fetch IRQ routing information. */
memset(&dpmi_regs, 0, sizeof(dpmi_regs));
dpmi_regs.eax = 0xb10e;
dpmi_regs.ebx = 0x0000;
dpmi_regs.es = table_segment;
dpmi_regs.edi = 0x0000;
dpmi_regs.ds = 0xf000;
segread(&seg_regs);
regs.w.ax = 0x0300;
regs.w.bx = 0x001a;
regs.w.cx = 0x0000;
seg_regs.es = FP_SEG(&dpmi_regs);
regs.x.edi = FP_OFF(&dpmi_regs);
regs.w.cflag = 0;
int386x(0x31, &regs, &regs, &seg_regs);
if (regs.w.cflag) {
printf("DPMI call failed. (AX=%04X)\n", regs.w.ax);
return 1;
}
/* Specify where the IRQ routing information will be placed. */
table->len = buf_size;
table->data_ptr = (void far *) table;
/* Call PCI BIOS to fetch IRQ routing information. */
rp.w.ax = 0xb10e;
rp.w.bx = 0x0000;
rp.w.es = FP_SEG(table->data_ptr);
rp.w.di = FP_OFF(table->data_ptr);
table->data_ptr = &table->entry[0];
rp.w.ds = 0xf000;
intr(0x1a, &rp);
/* Check for any returned error. */
if ((rp.h.ah == 0x59) && (table->len > buf_size)) {
i = (dpmi_regs.eax >> 8) & 0xff;
if ((i == 0x59) && (table->len > buf_size)) {
/* Re-allocate buffer with the requested size. */
buf_size = table->len;
printf("PCI BIOS claims %d bytes for table entries, ", buf_size);
free_realmode(table_segment);
if (buf_size >= 65530) {
printf("which looks invalid.\n");
return 1;
}
printf("retrying...\n");
buf_size += 2;
free(table);
goto retry_buf;
} else if (rp.h.ah) {
} else if (i) {
/* Something else went wrong. */
printf("PCI BIOS call failed. (AH=%02X)\n", rp.h.ah);
printf("PCI BIOS call failed. (AH=%02X)\n", i);
free_realmode(table_segment);
return 1;
}
@@ -1039,6 +1079,7 @@ retry_buf:
entries = table->len / sizeof(table->entry[0]);
if (!entries) {
printf("/* No entries found! */\n");
free_realmode(table_segment);
return 1;
}
@@ -1204,6 +1245,7 @@ next_entry:
entry++;
}
free_realmode(table_segment);
return 0;
}
#endif
@@ -1342,7 +1384,7 @@ usage:
printf("\n");
printf("%s -s [-d]\n", argv[0]);
printf("∟ Display all devices on the PCI bus. Specify -d to dump registers as well.\n");
#if defined(__WATCOMC__) && !defined(M_I386)
#if defined(__WATCOMC__)
printf("\n");
printf("%s -t [-8]\n", argv[0]);
printf("∟ Display BIOS IRQ steering table. Specify -8 to display as 86Box code.\n");
@@ -1392,7 +1434,7 @@ usage:
else
return scan_buses('\0');
}
#if defined(__WATCOMC__) && !defined(M_I386)
#if defined(__WATCOMC__)
else if (argv[1][1] == 't') {
/* Steering table display only requires a single optional parameter. */
if ((argc >= 3) && (strlen(argv[2]) > 1))