OpenBSD-4.6/lib/libarch/alpha/bwx.c
/* $OpenBSD: bwx.c,v 1.4 2003/10/06 22:29:45 miod Exp $ */
/*-
* Copyright (c) 1998 Doug Rabson
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#define vm_page_size (sysconf(_SC_PAGESIZE)) /* XXX */
#include <sys/param.h>
#include <sys/mman.h>
#include <sys/fcntl.h>
#include <sys/sysctl.h>
#include <err.h>
#include <paths.h>
#include <machine/bwx.h>
#include <machine/sysarch.h>
#include <stdlib.h>
#include <unistd.h>
#include "io.h"
#define PATH_APERTURE "/dev/xf86"
#define mb() __asm__ __volatile__("mb" : : : "memory")
#define wmb() __asm__ __volatile__("wmb" : : : "memory")
static int mem_fd = -1; /* file descriptor to /dev/mem */
static void *bwx_int1_ports = MAP_FAILED; /* mapped int1 io ports */
static void *bwx_int2_ports = MAP_FAILED; /* mapped int2 io ports */
static void *bwx_int4_ports = MAP_FAILED; /* mapped int4 io ports */
static u_int64_t bwx_io_base; /* physical address of ports */
static u_int64_t bwx_mem_base; /* physical address of bwx mem */
static void
bwx_open_mem(void)
{
if (mem_fd != -1)
return;
mem_fd = open(_PATH_MEM, O_RDWR);
if (mem_fd < 0)
mem_fd = open(PATH_APERTURE, O_RDWR);
if (mem_fd < 0)
err(1, "Failed to open both %s and %s", _PATH_MEM,
PATH_APERTURE);
}
static void
bwx_close_mem(void)
{
if (mem_fd != -1) {
close(mem_fd);
mem_fd = -1;
}
}
static void
bwx_init(void)
{
size_t len = sizeof(u_int64_t);
int error;
int mib[3];
mib[0] = CTL_MACHDEP;
mib[1] = CPU_CHIPSET;
mib[2] = CPU_CHIPSET_PORTS;
if ((error = sysctl(mib, 3, &bwx_io_base, &len, NULL, 0)) < 0)
err(1, "machdep.chipset.ports_base");
mib[2] = CPU_CHIPSET_MEM;
if ((error = sysctl(mib, 3, &bwx_mem_base, &len, 0, 0)) < 0)
err(1, "machdep.chipset.memory");
}
static int
bwx_ioperm(u_int32_t from, u_int32_t num, int on)
{
u_int32_t start, end;
if (bwx_int1_ports == MAP_FAILED)
bwx_init();
if (!on)
return -1; /* XXX can't unmap yet */
if (bwx_int1_ports != MAP_FAILED)
return 0;
bwx_open_mem();
start = trunc_page(from);
end = round_page(from + num);
if ((bwx_int1_ports = mmap(0, end-start, PROT_READ|PROT_WRITE,
MAP_SHARED, mem_fd, bwx_io_base + BWX_EV56_INT1 + start)) ==
MAP_FAILED)
err(1, "mmap int1");
if ((bwx_int2_ports = mmap(0, end-start, PROT_READ|PROT_WRITE,
MAP_SHARED, mem_fd, bwx_io_base + BWX_EV56_INT2 + start)) ==
MAP_FAILED)
err(1, "mmap int2");
if ((bwx_int4_ports = mmap(0, end-start, PROT_READ|PROT_WRITE,
MAP_SHARED, mem_fd, bwx_io_base + BWX_EV56_INT4 + start)) ==
MAP_FAILED)
err(1, "mmap int4");
bwx_close_mem();
return 0;
}
static u_int8_t
bwx_inb(u_int32_t port)
{
mb();
return alpha_ldbu(bwx_int1_ports + port);
}
static u_int16_t
bwx_inw(u_int32_t port)
{
mb();
return alpha_ldwu(bwx_int2_ports + port);
}
static u_int32_t
bwx_inl(u_int32_t port)
{
mb();
return alpha_ldlu(bwx_int4_ports + port);
}
static void
bwx_outb(u_int32_t port, u_int8_t val)
{
alpha_stb(bwx_int1_ports + port, val);
mb();
wmb();
}
static void
bwx_outw(u_int32_t port, u_int16_t val)
{
alpha_stw(bwx_int2_ports + port, val);
mb();
wmb();
}
static void
bwx_outl(u_int32_t port, u_int32_t val)
{
alpha_stl(bwx_int4_ports + port, val);
mb();
wmb();
}
struct bwx_mem_handle {
void *virt1; /* int1 address in user address-space */
void *virt2; /* int2 address in user address-space */
void *virt4; /* int4 address in user address-space */
};
static void *
bwx_map_memory(u_int32_t address, u_int32_t size)
{
struct bwx_mem_handle *h;
size_t sz = (size_t)size << 5;
h = malloc(sizeof(struct bwx_mem_handle));
if (h == NULL) return NULL;
bwx_open_mem();
h->virt1 = mmap(0, sz, PROT_READ|PROT_WRITE, MAP_SHARED,
mem_fd, bwx_mem_base + BWX_EV56_INT1 + address);
if (h->virt1 == MAP_FAILED) {
bwx_close_mem();
free(h);
return NULL;
}
h->virt2 = mmap(0, sz, PROT_READ|PROT_WRITE, MAP_SHARED,
mem_fd, bwx_mem_base + BWX_EV56_INT2 + address);
if (h->virt2 == MAP_FAILED) {
munmap(h->virt1, sz);
bwx_close_mem();
free(h);
return NULL;
}
h->virt4 = mmap(0, sz, PROT_READ|PROT_WRITE, MAP_SHARED,
mem_fd, bwx_mem_base + BWX_EV56_INT4 + address);
if (h->virt4 == MAP_FAILED) {
munmap(h->virt1, sz);
munmap(h->virt2, sz);
bwx_close_mem();
free(h);
return NULL;
}
bwx_close_mem();
return h;
}
static void
bwx_unmap_memory(void *handle, u_int32_t size)
{
struct bwx_mem_handle *h = handle;
size_t sz = (size_t)size << 5;
munmap(h->virt1, sz);
munmap(h->virt2, sz);
munmap(h->virt4, sz);
free(h);
}
static u_int8_t
bwx_readb(void *handle, u_int32_t offset)
{
struct bwx_mem_handle *h = handle;
return alpha_ldbu(h->virt1 + offset);
}
static u_int16_t
bwx_readw(void *handle, u_int32_t offset)
{
struct bwx_mem_handle *h = handle;
return alpha_ldwu(h->virt2 + offset);
}
static u_int32_t
bwx_readl(void *handle, u_int32_t offset)
{
struct bwx_mem_handle *h = handle;
return alpha_ldlu(h->virt4 + offset);
}
static void
bwx_writeb(void *handle, u_int32_t offset, u_int8_t val)
{
struct bwx_mem_handle *h = handle;
alpha_stb(h->virt1 + offset, val);
}
static void
bwx_writew(void *handle, u_int32_t offset, u_int16_t val)
{
struct bwx_mem_handle *h = handle;
alpha_stw(h->virt2 + offset, val);
}
static void
bwx_writel(void *handle, u_int32_t offset, u_int32_t val)
{
struct bwx_mem_handle *h = handle;
alpha_stl(h->virt4 + offset, val);
}
struct io_ops bwx_io_ops = {
bwx_ioperm,
bwx_inb,
bwx_inw,
bwx_inl,
bwx_outb,
bwx_outw,
bwx_outl,
bwx_map_memory,
bwx_unmap_memory,
bwx_readb,
bwx_readw,
bwx_readl,
bwx_writeb,
bwx_writew,
bwx_writel,
};