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