From dee9ca901fd3f2edec7af8f82300257b285067b0 Mon Sep 17 00:00:00 2001
From: Javier <dev.git@javispedro.com>
Date: Sun, 27 Feb 2022 17:40:45 +0100
Subject: initial import

---
 pci.h | 122 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 122 insertions(+)
 create mode 100644 pci.h

(limited to 'pci.h')

diff --git a/pci.h b/pci.h
new file mode 100644
index 0000000..265c38a
--- /dev/null
+++ b/pci.h
@@ -0,0 +1,122 @@
+/*
+ * VBMouse - PCI BIOS communication routines
+ * Copyright (C) 2022 Javier S. Pedro
+ *
+ * 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; either version 2
+ * of the License, or (at your option) any later version.
+
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#ifndef PCI_H
+#define PCI_H
+
+typedef unsigned char  pcierr;
+enum {
+	PCI_SUCCESSFUL = 0,
+	PCI_GENERIC_ERROR = 1,
+	PCI_FUNC_NOT_SUPPORTED = 0x81,
+	PCI_BAD_VENDOR_ID = 0x83,
+	PCI_DEVICE_NOT_FOUND = 0x86,
+	PCI_BAD_REGISTER_NUMBER = 0x87,
+	PCI_SET_FAILED = 0x88,
+	PCI_BUFFER_TOO_SMALL = 0x89
+};
+
+typedef unsigned short  pcisel;
+
+static pcierr pci_init_bios(void);
+#pragma aux pci_init_bios = \
+	"mov ax, 0xB101" \
+	"int 0x1A" \
+	"jc not_found" \
+	"cmp ah, 0" \
+	"jne not_found" \
+	"cmp edx, ' ICP'" \
+	"jne not_found" \
+	"mov ah, 0" \
+	"jmp end" \
+	"not_found: mov ah, 1" \
+	"end:" \
+	__value [ah] \
+	__modify [ax bx cx dx]
+
+static pcierr pci_find_device(pcisel *sel, unsigned short vendor_id, unsigned short dev_id, unsigned short index);
+#pragma aux pci_find_device = \
+	"mov ax, 0xB102" \
+	"int 0x1A" \
+	"jnc success" \
+	"mov ah, 1" \
+	"success: mov [es:di], bx" \
+	__parm [es di] [dx] [cx] [si] \
+	__value [ah] \
+	__modify [ax bx]
+
+/* Reading from configuration space */
+
+static pcierr pci_read_config_byte(pcisel sel, unsigned char reg, unsigned char *data);
+#pragma aux pci_read_config_byte = \
+	"mov ax, 0xB108" \
+	"int 0x1A" \
+	"mov [es:si], cl" \
+	__parm [bx] [di] [es si] \
+	__value [ah] \
+	__modify [ax cx]
+
+static pcierr pci_read_config_word(pcisel sel, unsigned char reg, unsigned short *data);
+#pragma aux pci_read_config_word = \
+	"mov ax, 0xB109" \
+	"int 0x1A" \
+	"mov [es:si], cx" \
+	__parm [bx] [di] [es si] \
+	__value [ah] \
+	__modify [ax cx]
+
+static pcierr pci_read_config_dword(pcisel sel, unsigned char reg, unsigned long *data);
+#pragma aux pci_read_config_dword = \
+	"mov ax, 0xB10A" \
+	"int 0x1A" \
+	"mov [es:si], ecx" \
+	__parm [bx] [di] [es si] \
+	__value [ah] \
+	__modify [ax cx]
+
+/* Writing to configuration space */
+
+static pcierr pci_write_config_byte(pcisel sel, unsigned char reg, unsigned char data);
+#pragma aux pci_write_config_byte = \
+	"mov ax, 0xB10B" \
+	"int 0x1A" \
+	__parm [bx] [di] [cl] \
+	__value [ah] \
+	__modify [ax]
+
+static pcierr pci_write_config_word(pcisel sel, unsigned char reg, unsigned short data);
+#pragma aux pci_write_config_word = \
+	"mov ax, 0xB10C" \
+	"int 0x1A" \
+	__parm [bx] [di] [cx] \
+	__value [ah] \
+	__modify [ax cx]
+
+static pcierr pci_write_config_dword(pcisel sel, unsigned char reg, unsigned long data);
+#pragma aux pci_write_config_dword = \
+	"mov ax, 0xB10D" \
+	"shl esi, 16" \
+	"and ecx, 0xFFFF" \
+	"or ecx, esi" \
+	"int 0x1A" \
+	__parm [bx] [di] [si cx] \
+	__value [ah] \
+	__modify [ax cx]
+
+#endif
-- 
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