dd56e3b6bc
bootloader. Implement the following routines: pcibios-device-count count the number of instances of a devid pcibios-read-config read pci config space pcibios-write-config write pci config space pcibios-find-devclass find the nth device with a given devclass pcibios-find-device find the nth device with a given devid pcibios-locator convert bus device function ti pcibios locator These commands are thin wrappers over their PCI BIOS 2.1 counterparts. More informaiton, such as it is, can be found in the standard. Export a nunmber of pcibios.X variables into the environment to report what the PCI IDENTIFY command returned. Also implmenet a new command line primitive (pci-device-count), but don't include it by default just yet, since it depends on the recently added words and any errors here can render a system unbootable. This is intended to allow the boot loader to do special things based on the hardware it finds. This could be have special settings that are optimized for the specific cards, or even loading special drivers. It goes without saying that writing to pci config space should not be done without a just cause and a sound mind. Sponsored by: Netflix
429 lines
10 KiB
C
429 lines
10 KiB
C
/*-
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* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* PnP enumerator using the PCI BIOS.
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*/
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#include <stand.h>
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#include <machine/stdarg.h>
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#include <bootstrap.h>
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#include <isapnp.h>
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#include <btxv86.h>
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#include "libi386.h"
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/*
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* Stupid PCI BIOS interface doesn't let you simply enumerate everything
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* that's there, instead you have to ask it if it has something.
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*
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* So we have to scan by class code, subclass code and sometimes programming
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* interface.
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*/
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struct pci_progif
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{
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int pi_code;
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const char *pi_name;
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};
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static struct pci_progif progif_null[] = {
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{0x0, NULL},
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{-1, NULL}
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};
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static struct pci_progif progif_display[] = {
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{0x0, "VGA"},
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{0x1, "8514"},
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{-1, NULL}
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};
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static struct pci_progif progif_ide[] = {
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{0x00, NULL},
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{0x01, NULL},
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{0x02, NULL},
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{0x03, NULL},
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{0x04, NULL},
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{0x05, NULL},
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{0x06, NULL},
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{0x07, NULL},
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{0x08, NULL},
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{0x09, NULL},
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{0x0a, NULL},
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{0x0b, NULL},
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{0x0c, NULL},
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{0x0d, NULL},
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{0x0e, NULL},
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{0x0f, NULL},
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{0x80, NULL},
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{0x81, NULL},
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{0x82, NULL},
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{0x83, NULL},
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{0x84, NULL},
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{0x85, NULL},
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{0x86, NULL},
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{0x87, NULL},
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{0x88, NULL},
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{0x89, NULL},
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{0x8a, NULL},
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{0x8b, NULL},
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{0x8c, NULL},
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{0x8d, NULL},
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{0x8e, NULL},
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{0x8f, NULL},
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{-1, NULL}
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};
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static struct pci_progif progif_serial[] = {
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{0x0, "8250"},
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{0x1, "16450"},
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{0x2, "16550"},
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{-1, NULL}
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};
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static struct pci_progif progif_parallel[] = {
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{0x0, "Standard"},
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{0x1, "Bidirectional"},
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{0x2, "ECP"},
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{-1, NULL}
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};
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static struct pci_progif progif_firewire[] = {
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{0x10, "OHCI"},
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{-1, NULL}
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};
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struct pci_subclass
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{
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int ps_subclass;
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const char *ps_name;
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struct pci_progif *ps_progif; /* if set, use for programming interface value(s) */
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};
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static struct pci_subclass subclass_old[] = {
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{0x0, "Old non-VGA", progif_null},
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{0x1, "Old VGA", progif_null},
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{-1, NULL, NULL}
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};
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static struct pci_subclass subclass_mass[] = {
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{0x0, "SCSI", progif_null},
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{0x1, "IDE", progif_ide},
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{0x2, "Floppy disk", progif_null},
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{0x3, "IPI", progif_null},
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{0x4, "RAID", progif_null},
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{0x80, "mass storage", progif_null},
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{-1, NULL, NULL}
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};
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static struct pci_subclass subclass_net[] = {
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{0x0, "Ethernet", progif_null},
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{0x1, "Token ring", progif_null},
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{0x2, "FDDI", progif_null},
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{0x3, "ATM", progif_null},
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{0x80, "network", progif_null},
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{-1, NULL, NULL}
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};
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static struct pci_subclass subclass_display[] = {
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{0x0, NULL, progif_display},
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{0x1, "XGA", progif_null},
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{0x80, "other", progif_null},
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{-1, NULL, NULL}
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};
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static struct pci_subclass subclass_comms[] = {
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{0x0, "serial", progif_serial},
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{0x1, "parallel", progif_parallel},
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{0x80, "communications", progif_null},
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{-1, NULL, NULL}
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};
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static struct pci_subclass subclass_serial[] = {
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{0x0, "FireWire", progif_firewire},
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{0x1, "ACCESS.bus", progif_null},
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{0x2, "SSA", progif_null},
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{0x3, "USB", progif_null},
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{0x4, "Fibrechannel", progif_null},
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{-1, NULL, NULL}
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};
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static struct pci_class
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{
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int pc_class;
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const char *pc_name;
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struct pci_subclass *pc_subclass;
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} pci_classes[] = {
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{0x0, "device", subclass_old},
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{0x1, "controller", subclass_mass},
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{0x2, "controller", subclass_net},
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{0x3, "display", subclass_display},
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{0x7, "controller", subclass_comms},
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{0xc, "controller", subclass_serial},
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{-1, NULL, NULL}
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};
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static void biospci_enumerate(void);
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static void biospci_addinfo(int devid, struct pci_class *pc, struct pci_subclass *psc, struct pci_progif *ppi);
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struct pnphandler biospcihandler =
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{
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"PCI BIOS",
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biospci_enumerate
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};
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#define PCI_BIOS_PRESENT 0xb101
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#define FIND_PCI_DEVICE 0xb102
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#define FIND_PCI_CLASS_CODE 0xb103
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#define GENERATE_SPECIAL_CYCLE 0xb106
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#define READ_CONFIG_BYTE 0xb108
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#define READ_CONFIG_WORD 0xb109
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#define READ_CONFIG_DWORD 0xb10a
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#define WRITE_CONFIG_BYTE 0xb10b
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#define WRITE_CONFIG_WORD 0xb10c
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#define WRITE_CONFIG_DWORD 0xb10d
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#define GET_IRQ_ROUTING_OPTIONS 0xb10e
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#define SET_PCI_IRQ 0xb10f
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#define PCI_INT 0x1a
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#define PCI_SIGNATURE 0x20494350 /* AKA "PCI " */
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void
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biospci_detect(void)
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{
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uint16_t version, hwcap, maxbus;
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char buf[24];
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/* Find the PCI BIOS */
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v86.ctl = V86_FLAGS;
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v86.addr = PCI_INT;
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v86.eax = PCI_BIOS_PRESENT;
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v86.edi = 0x0;
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v86int();
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/* Check for OK response */
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if (V86_CY(v86.efl) || ((v86.eax & 0xff00) != 0) ||
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(v86.edx != PCI_SIGNATURE))
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return;
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version = v86.ebx & 0xffff;
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hwcap = v86.eax & 0xff;
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maxbus = v86.ecx & 0xff;
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#if 0
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printf("PCI BIOS %d.%d%s%s maxbus %d\n",
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bcd2bin((version >> 8) & 0xf), bcd2bin(version & 0xf),
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(hwcap & 1) ? " config1" : "", (hwcap & 2) ? " config2" : "",
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maxbus);
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#endif
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sprintf(buf, "%d", bcd2bin((version >> 8) & 0xf));
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setenv("pcibios.major", buf, 1);
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sprintf(buf, "%d", bcd2bin(version & 0xf));
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setenv("pcibios.minor", buf, 1);
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sprintf(buf, "%d", !!(hwcap & 1));
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setenv("pcibios.config1", buf, 1);
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sprintf(buf, "%d", !!(hwcap & 2));
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setenv("pcibios.config2", buf, 1);
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sprintf(buf, "%d", maxbus);
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setenv("pcibios.maxbus", buf, 1);
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}
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static void
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biospci_enumerate(void)
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{
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int device_index, err;
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uint32_t locator, devid;
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struct pci_class *pc;
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struct pci_subclass *psc;
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struct pci_progif *ppi;
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/* Iterate over known classes */
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for (pc = pci_classes; pc->pc_class >= 0; pc++) {
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/* Iterate over subclasses */
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for (psc = pc->pc_subclass; psc->ps_subclass >= 0; psc++) {
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/* Iterate over programming interfaces */
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for (ppi = psc->ps_progif; ppi->pi_code >= 0; ppi++) {
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/* Scan for matches */
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for (device_index = 0; ; device_index++) {
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/* Look for a match */
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err = biospci_find_devclass((pc->pc_class << 16)
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+ (psc->ps_subclass << 8) + ppi->pi_code,
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device_index, &locator);
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if (err != 0)
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break;
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/* Read the device identifier from the nominated device */
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err = biospci_read_config(locator, 0, 2, &devid);
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if (err != 0)
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break;
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/* We have the device ID, create a PnP object and save everything */
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biospci_addinfo(devid, pc, psc, ppi);
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}
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}
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}
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}
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}
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static void
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biospci_addinfo(int devid, struct pci_class *pc, struct pci_subclass *psc, struct pci_progif *ppi)
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{
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struct pnpinfo *pi;
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char desc[80];
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/* build the description */
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desc[0] = 0;
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if (ppi->pi_name != NULL) {
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strcat(desc, ppi->pi_name);
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strcat(desc, " ");
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}
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if (psc->ps_name != NULL) {
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strcat(desc, psc->ps_name);
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strcat(desc, " ");
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}
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if (pc->pc_name != NULL)
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strcat(desc, pc->pc_name);
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pi = pnp_allocinfo();
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pi->pi_desc = strdup(desc);
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sprintf(desc,"0x%08x", devid);
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pnp_addident(pi, desc);
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pnp_addinfo(pi);
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}
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int
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biospci_find_devclass(uint32_t class, int index, uint32_t *locator)
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{
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v86.ctl = V86_FLAGS;
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v86.addr = PCI_INT;
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v86.eax = FIND_PCI_CLASS_CODE;
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v86.ecx = class;
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v86.esi = index;
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v86int();
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/* error */
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if (V86_CY(v86.efl) || (v86.eax & 0xff00))
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return (-1);
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*locator = v86.ebx;
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return (0);
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}
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int
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biospci_find_device(uint32_t devid, int index, uint32_t *locator)
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{
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v86.ctl = V86_FLAGS;
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v86.addr = PCI_INT;
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v86.eax = FIND_PCI_DEVICE;
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v86.edx = devid & 0xffff; /* EDX - Vendor ID */
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v86.ecx = (devid >> 16) & 0xffff; /* ECX - Device ID */
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v86.esi = index;
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v86int();
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/* error */
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if (V86_CY(v86.efl) || (v86.eax & 0xff00))
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return (-1);
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*locator = v86.ebx;
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return (0);
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}
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/*
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* Configuration space access methods.
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* width = 0(byte), 1(word) or 2(dword).
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*/
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int
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biospci_write_config(uint32_t locator, int offset, int width, uint32_t val)
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{
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v86.ctl = V86_FLAGS;
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v86.addr = PCI_INT;
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v86.eax = WRITE_CONFIG_BYTE + width;
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v86.ebx = locator;
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v86.edi = offset;
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v86.ecx = val;
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v86int();
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/* error */
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if (V86_CY(v86.efl) || (v86.eax & 0xff00))
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return (-1);
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return(0);
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}
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int
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biospci_read_config(uint32_t locator, int offset, int width, uint32_t *val)
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{
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v86.ctl = V86_FLAGS;
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v86.addr = PCI_INT;
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v86.eax = READ_CONFIG_BYTE + width;
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v86.ebx = locator;
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v86.edi = offset;
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v86int();
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/* error */
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if (V86_CY(v86.efl) || (v86.eax & 0xff00))
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return (-1);
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*val = v86.ecx;
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return (0);
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}
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uint32_t
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biospci_locator(int8_t bus, uint8_t device, uint8_t function)
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{
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return ((bus << 8) | ((device & 0x1f) << 3) | (function & 0x7));
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}
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/*
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* Counts the number of instances of devid we have in the system, as least as
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* far as the PCI BIOS is able to tell.
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*/
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int
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biospci_count_device_type(uint32_t devid)
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{
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int i;
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for (i = 0; 1; i++) {
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v86.ctl = V86_FLAGS;
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v86.addr = PCI_INT;
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v86.eax = FIND_PCI_DEVICE;
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v86.edx = devid & 0xffff; /* EDX - Vendor ID */
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v86.ecx = (devid >> 16) & 0xffff; /* ECX - Device ID */
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v86.esi = i;
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v86int();
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if (V86_CY(v86.efl) || (v86.eax & 0xff00))
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break;
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}
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return i;
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}
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