d20d17f6d4
Similar to OPAL calls, switch to big endian to do calls to RTAS. (Missed this one when I was doing the bulk commit of PowerPC64LE support.) Sponsored by: Tag1 Consulting, Inc.
272 lines
6.7 KiB
C
272 lines
6.7 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
|
|
*
|
|
* Copyright (c) 2011 Nathan Whitehorn
|
|
* 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("$FreeBSD$");
|
|
|
|
#include <sys/endian.h>
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/proc.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_page.h>
|
|
#include <vm/pmap.h>
|
|
|
|
#include <machine/bus.h>
|
|
#include <machine/md_var.h>
|
|
#include <machine/pcb.h>
|
|
#include <machine/rtas.h>
|
|
#include <machine/stdarg.h>
|
|
|
|
#include <dev/ofw/openfirm.h>
|
|
|
|
static MALLOC_DEFINE(M_RTAS, "rtas", "Run Time Abstraction Service");
|
|
|
|
static vm_offset_t rtas_bounce_phys;
|
|
static caddr_t rtas_bounce_virt;
|
|
static off_t rtas_bounce_offset;
|
|
static size_t rtas_bounce_size;
|
|
static uintptr_t rtas_private_data;
|
|
static struct mtx rtas_mtx;
|
|
static phandle_t rtas;
|
|
|
|
/* From ofwcall.S */
|
|
int rtascall(vm_offset_t callbuffer, uintptr_t rtas_privdat);
|
|
extern uintptr_t rtas_entry;
|
|
extern register_t rtasmsr;
|
|
|
|
/*
|
|
* After the VM is up, allocate RTAS memory and instantiate it
|
|
*/
|
|
|
|
static void rtas_setup(void *);
|
|
|
|
SYSINIT(rtas_setup, SI_SUB_KMEM, SI_ORDER_ANY, rtas_setup, NULL);
|
|
|
|
static void
|
|
rtas_setup(void *junk)
|
|
{
|
|
ihandle_t rtasi;
|
|
cell_t rtas_size = 0, rtas_ptr;
|
|
char path[31];
|
|
int result;
|
|
|
|
rtas = OF_finddevice("/rtas");
|
|
if (rtas == -1) {
|
|
rtas = 0;
|
|
return;
|
|
}
|
|
OF_package_to_path(rtas, path, sizeof(path));
|
|
|
|
mtx_init(&rtas_mtx, "RTAS", NULL, MTX_SPIN);
|
|
|
|
/* RTAS must be called with everything turned off in MSR */
|
|
rtasmsr = mfmsr();
|
|
rtasmsr &= ~(PSL_IR | PSL_DR | PSL_EE | PSL_SE | PSL_LE);
|
|
#ifdef __powerpc64__
|
|
rtasmsr &= ~PSL_SF;
|
|
#endif
|
|
|
|
/*
|
|
* Allocate rtas_size + one page of contiguous, wired physical memory
|
|
* that can fit into a 32-bit address space and accessed from real mode.
|
|
* This is used both to bounce arguments and for RTAS private data.
|
|
*
|
|
* It must be 4KB-aligned and not cross a 256 MB boundary.
|
|
*/
|
|
|
|
OF_getencprop(rtas, "rtas-size", &rtas_size, sizeof(rtas_size));
|
|
rtas_size = round_page(rtas_size);
|
|
rtas_bounce_virt = contigmalloc(rtas_size + PAGE_SIZE, M_RTAS, 0, 0,
|
|
ulmin(platform_real_maxaddr(), BUS_SPACE_MAXADDR_32BIT),
|
|
4096, 256*1024*1024);
|
|
|
|
rtas_private_data = vtophys(rtas_bounce_virt);
|
|
rtas_bounce_virt += rtas_size; /* Actual bounce area */
|
|
rtas_bounce_phys = vtophys(rtas_bounce_virt);
|
|
rtas_bounce_size = PAGE_SIZE;
|
|
|
|
/*
|
|
* Instantiate RTAS. We always use the 32-bit version.
|
|
*/
|
|
|
|
if (OF_hasprop(rtas, "linux,rtas-entry") &&
|
|
OF_hasprop(rtas, "linux,rtas-base")) {
|
|
OF_getencprop(rtas, "linux,rtas-base", &rtas_ptr,
|
|
sizeof(rtas_ptr));
|
|
rtas_private_data = rtas_ptr;
|
|
OF_getencprop(rtas, "linux,rtas-entry", &rtas_ptr,
|
|
sizeof(rtas_ptr));
|
|
} else {
|
|
rtasi = OF_open(path);
|
|
if (rtasi == 0) {
|
|
rtas = 0;
|
|
printf("Error initializing RTAS: could not open "
|
|
"node\n");
|
|
return;
|
|
}
|
|
|
|
result = OF_call_method("instantiate-rtas", rtasi, 1, 1,
|
|
(cell_t)rtas_private_data, &rtas_ptr);
|
|
OF_close(rtasi);
|
|
|
|
if (result != 0) {
|
|
rtas = 0;
|
|
rtas_ptr = 0;
|
|
printf("Error initializing RTAS (%d)\n", result);
|
|
return;
|
|
}
|
|
}
|
|
|
|
rtas_entry = (uintptr_t)(rtas_ptr);
|
|
}
|
|
|
|
static cell_t
|
|
rtas_real_map(const void *buf, size_t len)
|
|
{
|
|
cell_t phys;
|
|
|
|
mtx_assert(&rtas_mtx, MA_OWNED);
|
|
|
|
/*
|
|
* Make sure the bounce page offset satisfies any reasonable
|
|
* alignment constraint.
|
|
*/
|
|
rtas_bounce_offset += sizeof(register_t) -
|
|
(rtas_bounce_offset % sizeof(register_t));
|
|
|
|
if (rtas_bounce_offset + len > rtas_bounce_size) {
|
|
panic("Oversize RTAS call!");
|
|
return 0;
|
|
}
|
|
|
|
if (buf != NULL)
|
|
memcpy(rtas_bounce_virt + rtas_bounce_offset, buf, len);
|
|
else
|
|
return (0);
|
|
|
|
phys = rtas_bounce_phys + rtas_bounce_offset;
|
|
rtas_bounce_offset += len;
|
|
|
|
return (phys);
|
|
}
|
|
|
|
static void
|
|
rtas_real_unmap(cell_t physaddr, void *buf, size_t len)
|
|
{
|
|
mtx_assert(&rtas_mtx, MA_OWNED);
|
|
|
|
if (physaddr == 0)
|
|
return;
|
|
|
|
memcpy(buf, rtas_bounce_virt + (physaddr - rtas_bounce_phys), len);
|
|
}
|
|
|
|
/* Check if we have RTAS */
|
|
int
|
|
rtas_exists(void)
|
|
{
|
|
return (rtas != 0);
|
|
}
|
|
|
|
/* Call an RTAS method by token */
|
|
int
|
|
rtas_call_method(cell_t token, int nargs, int nreturns, ...)
|
|
{
|
|
vm_offset_t argsptr;
|
|
jmp_buf env, *oldfaultbuf;
|
|
va_list ap;
|
|
struct {
|
|
cell_t token;
|
|
cell_t nargs;
|
|
cell_t nreturns;
|
|
cell_t args_n_results[12];
|
|
} args;
|
|
int n, result;
|
|
|
|
if (!rtas_exists() || nargs + nreturns > 12)
|
|
return (-1);
|
|
|
|
args.token = htobe32(token);
|
|
va_start(ap, nreturns);
|
|
|
|
mtx_lock_spin(&rtas_mtx);
|
|
rtas_bounce_offset = 0;
|
|
|
|
args.nargs = htobe32(nargs);
|
|
args.nreturns = htobe32(nreturns);
|
|
|
|
for (n = 0; n < nargs; n++)
|
|
args.args_n_results[n] = htobe32(va_arg(ap, cell_t));
|
|
|
|
argsptr = rtas_real_map(&args, sizeof(args));
|
|
|
|
/* Get rid of any stale machine checks that have been waiting. */
|
|
__asm __volatile ("sync; isync");
|
|
oldfaultbuf = curthread->td_pcb->pcb_onfault;
|
|
curthread->td_pcb->pcb_onfault = &env;
|
|
if (!setjmp(env)) {
|
|
__asm __volatile ("sync");
|
|
result = rtascall(argsptr, rtas_private_data);
|
|
__asm __volatile ("sync; isync");
|
|
} else {
|
|
result = RTAS_HW_ERROR;
|
|
}
|
|
curthread->td_pcb->pcb_onfault = oldfaultbuf;
|
|
__asm __volatile ("sync");
|
|
|
|
rtas_real_unmap(argsptr, &args, sizeof(args));
|
|
mtx_unlock_spin(&rtas_mtx);
|
|
|
|
if (result < 0)
|
|
return (result);
|
|
|
|
for (n = nargs; n < nargs + nreturns; n++)
|
|
*va_arg(ap, cell_t *) = be32toh(args.args_n_results[n]);
|
|
return (result);
|
|
}
|
|
|
|
/* Look up an RTAS token */
|
|
cell_t
|
|
rtas_token_lookup(const char *method)
|
|
{
|
|
cell_t token;
|
|
|
|
if (!rtas_exists())
|
|
return (-1);
|
|
|
|
if (OF_getencprop(rtas, method, &token, sizeof(token)) == -1)
|
|
return (-1);
|
|
|
|
return (token);
|
|
}
|