FreeBSD-5.3/lib/libio/swiz.c
/*-
* 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>
__FBSDID("$FreeBSD: src/lib/libio/swiz.c,v 1.5 2001/09/30 21:41:46 dillon Exp $");
#include <sys/param.h>
#include <sys/mman.h>
#include <sys/fcntl.h>
#include <sys/sysctl.h>
#include <err.h>
#include <paths.h>
#include <machine/swiz.h>
#include <machine/sysarch.h>
#include <stdlib.h>
#include "io.h"
#define mb() __asm__ __volatile__("mb" : : : "memory")
#define wmb() __asm__ __volatile__("wmb" : : : "memory")
static int mem_fd; /* file descriptor to /dev/mem */
static void *swiz_ports; /* mapped io ports */
static u_int64_t swiz_io_base; /* physical address of ports */
static u_int64_t swiz_mem_base; /* physical address of sparse mem */
static u_int64_t swiz_dense_base; /* physical address of dense mem */
static u_int64_t swiz_hae_mask; /* mask address bits for hae */
static u_int32_t swiz_hae; /* cache of current hae */
static void
swiz_init()
{
size_t len = sizeof(u_int64_t);
int error;
mem_fd = open(_PATH_MEM, O_RDWR);
if (mem_fd < 0)
err(1, _PATH_MEM);
swiz_ports = mmap(0, 1L<<32, PROT_READ, MAP_ANON, -1, 0);
if ((error = sysctlbyname("hw.chipset.ports", &swiz_io_base, &len,
0, 0)) < 0)
err(1, "hw.chipset.ports");
if ((error = sysctlbyname("hw.chipset.memory", &swiz_mem_base, &len,
0, 0)) < 0)
err(1, "hw.chipset.memory");
if ((error = sysctlbyname("hw.chipset.dense", &swiz_dense_base, &len,
0, 0)) < 0)
err(1, "hw.chipset.memory");
if ((error = sysctlbyname("hw.chipset.hae_mask", &swiz_hae_mask, &len,
0, 0)) < 0)
err(1, "hw.chipset.memory");
}
static int
swiz_ioperm(u_int32_t from, u_int32_t num, int on)
{
u_int64_t start, end;
void *addr;
if (!swiz_ports)
swiz_init();
if (!on)
return -1; /* XXX can't unmap yet */
start = trunc_page(from << 5);
end = round_page((from + num) << 5);
addr = swiz_ports + start;
munmap(addr, end - start);
mmap(addr, end - start, PROT_READ|PROT_WRITE, MAP_SHARED,
mem_fd, swiz_io_base + start);
return 0;
}
static u_int8_t
swiz_inb(u_int32_t port)
{
mb();
return SPARSE_READ_BYTE(swiz_ports, port);
}
static u_int16_t
swiz_inw(u_int32_t port)
{
mb();
return SPARSE_READ_WORD(swiz_ports, port);
}
static u_int32_t
swiz_inl(u_int32_t port)
{
mb();
return SPARSE_READ_LONG(swiz_ports, port);
}
static void
swiz_outb(u_int32_t port, u_int8_t val)
{
SPARSE_WRITE_BYTE(swiz_ports, port, val);
wmb();
}
static void
swiz_outw(u_int32_t port, u_int16_t val)
{
SPARSE_WRITE_WORD(swiz_ports, port, val);
wmb();
}
static void
swiz_outl(u_int32_t port, u_int32_t val)
{
SPARSE_WRITE_LONG(swiz_ports, port, val);
wmb();
}
struct swiz_mem_handle {
u_int32_t phys; /* address in PCI address-space */
void *virt; /* address in user address-space */
u_int32_t size; /* size of mapped region */
};
static void *
swiz_map_memory(u_int32_t address, u_int32_t size)
{
struct swiz_mem_handle *h;
h = malloc(sizeof(struct swiz_mem_handle));
if (!h) return 0;
h->phys = address;
h->virt = mmap(0, size << 5, PROT_READ|PROT_WRITE, MAP_SHARED,
mem_fd,
swiz_mem_base + ((address & ~swiz_hae_mask) << 5));
if ((long) h->virt == -1) {
free(h);
return 0;
}
h->size = size << 5;
return h;
}
static void
swiz_unmap_memory(void *handle, u_int32_t size)
{
struct swiz_mem_handle *h = handle;
munmap(h->virt, h->size);
free(h);
}
static void
swiz_sethae(vm_offset_t phys)
{
u_int32_t hae = phys & swiz_hae_mask;
if (hae != swiz_hae) {
alpha_sethae(hae);
swiz_hae = hae;
}
}
static u_int8_t
swiz_readb(void *handle, u_int32_t offset)
{
struct swiz_mem_handle *h = handle;
swiz_sethae(h->phys + offset);
return SPARSE_READ_BYTE(h->virt, offset);
}
static u_int16_t
swiz_readw(void *handle, u_int32_t offset)
{
struct swiz_mem_handle *h = handle;
swiz_sethae(h->phys + offset);
return SPARSE_READ_WORD(h->virt, offset);
}
static u_int32_t
swiz_readl(void *handle, u_int32_t offset)
{
struct swiz_mem_handle *h = handle;
swiz_sethae(h->phys + offset);
return SPARSE_READ_LONG(h->virt, offset);
}
static void
swiz_writeb(void *handle, u_int32_t offset, u_int8_t val)
{
struct swiz_mem_handle *h = handle;
swiz_sethae(h->phys + offset);
SPARSE_WRITE_BYTE(h->virt, offset, val);
}
static void
swiz_writew(void *handle, u_int32_t offset, u_int16_t val)
{
struct swiz_mem_handle *h = handle;
swiz_sethae(h->phys + offset);
SPARSE_WRITE_WORD(h->virt, offset, val);
}
static void
swiz_writel(void *handle, u_int32_t offset, u_int32_t val)
{
struct swiz_mem_handle *h = handle;
swiz_sethae(h->phys + offset);
SPARSE_WRITE_LONG(h->virt, offset, val);
}
struct io_ops swiz_io_ops = {
swiz_ioperm,
swiz_inb,
swiz_inw,
swiz_inl,
swiz_outb,
swiz_outw,
swiz_outl,
swiz_map_memory,
swiz_unmap_memory,
swiz_readb,
swiz_readw,
swiz_readl,
swiz_writeb,
swiz_writew,
swiz_writel,
};