rtas.c revision 227293
1139749Simp/*- 291355Simp * Copyright (c) 2011 Nathan Whitehorn 391355Simp * All rights reserved. 491355Simp * 591355Simp * Redistribution and use in source and binary forms, with or without 691355Simp * modification, are permitted provided that the following conditions 791355Simp * are met: 891355Simp * 1. Redistributions of source code must retain the above copyright 991355Simp * notice, this list of conditions and the following disclaimer. 1091355Simp * 2. Redistributions in binary form must reproduce the above copyright 1191355Simp * notice, this list of conditions and the following disclaimer in the 1291355Simp * documentation and/or other materials provided with the distribution. 1391355Simp * 1491355Simp * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1591355Simp * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1691355Simp * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1791355Simp * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1891355Simp * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1991355Simp * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2091355Simp * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2191355Simp * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2291355Simp * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2391355Simp * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2491355Simp * SUCH DAMAGE. 2591355Simp */ 2691355Simp 2791355Simp#include <sys/cdefs.h> 2891355Simp__FBSDID("$FreeBSD: head/sys/powerpc/ofw/rtas.c 227293 2011-11-07 06:44:47Z ed $"); 2991355Simp 3091355Simp#include <sys/param.h> 3191355Simp#include <sys/kernel.h> 3291355Simp#include <sys/lock.h> 33165217Sjhb#include <sys/mutex.h> 3491355Simp#include <sys/systm.h> 3591355Simp#include <sys/proc.h> 3691355Simp 37154599Sjhb#include <vm/vm.h> 3891355Simp#include <vm/vm_page.h> 39154599Sjhb#include <vm/pmap.h> 40102440Sjhb 41232403Sjhb#include <machine/bus.h> 42232403Sjhb#include <machine/md_var.h> 43280970Sjhb#include <machine/pcb.h> 44280970Sjhb#include <machine/pmap.h> 45280970Sjhb#include <machine/rtas.h> 46232403Sjhb#include <machine/stdarg.h> 47232403Sjhb 48211430Sjhb#include <dev/ofw/openfirm.h> 49214110Sjkim 50211430Sjhbstatic MALLOC_DEFINE(M_RTAS, "rtas", "Run Time Abstraction Service"); 51172394Smarius 52172394Smariusstatic vm_offset_t rtas_bounce_phys; 53102440Sjhbstatic caddr_t rtas_bounce_virt; 54153898Simpstatic off_t rtas_bounce_offset; 55153898Simpstatic size_t rtas_bounce_size; 56232403Sjhbstatic uintptr_t rtas_private_data; 57128058Simpstatic struct mtx rtas_mtx; 5891355Simpstatic phandle_t rtas; 5991355Simp 6091355Simp/* From ofwcall.S */ 6191355Simpint rtascall(vm_offset_t callbuffer, uintptr_t rtas_privdat); 6291355Simpextern uintptr_t rtas_entry; 6391355Simpextern register_t rtasmsr; 64169221Sjhb 65169221Sjhbint setfault(faultbuf); /* defined in locore.S */ 66169221Sjhb 67169221Sjhb/* 68169221Sjhb * After the VM is up, allocate RTAS memory and instantiate it 69163163Sjmg */ 70163163Sjmg 71163163Sjmgstatic void rtas_setup(void *); 72163163Sjmg 7391355SimpSYSINIT(rtas_setup, SI_SUB_KMEM, SI_ORDER_ANY, rtas_setup, NULL); 7491355Simp 7591355Simpstatic void 76119266Simprtas_setup(void *junk) 7791355Simp{ 7891355Simp ihandle_t rtasi; 79119266Simp cell_t rtas_size = 0, rtas_ptr; 80113544Smdodd char path[31]; 81113544Smdodd int result; 82113544Smdodd 83113544Smdodd rtas = OF_finddevice("/rtas"); 84232472Sjhb if (rtas == -1) { 85232472Sjhb rtas = 0; 86153560Sjhb return; 87153560Sjhb } 88232472Sjhb OF_package_to_path(rtas, path, sizeof(path)); 89232472Sjhb rtasi = OF_open(path); 90164264Sjhb if (rtasi == 0) { 91166176Sjhb rtas = 0; 92292907Sngie printf("Error initializing RTAS: could not open node\n"); 93292907Sngie return; 94292907Sngie } 95292907Sngie 96292907Sngie mtx_init(&rtas_mtx, "RTAS", MTX_DEF, 0); 97166176Sjhb 98169221Sjhb /* RTAS must be called with everything turned off in MSR */ 99164264Sjhb rtasmsr = mfmsr(); 100164264Sjhb rtasmsr &= ~(PSL_IR | PSL_DR | PSL_EE | PSL_SE); 101166176Sjhb #ifdef __powerpc64__ 102294340Sjhb rtasmsr &= ~PSL_SF; 103294340Sjhb #endif 10491355Simp 10591355Simp /* 10691355Simp * Allocate rtas_size + one page of contiguous, wired physical memory 107253450Sjhb * that can fit into a 32-bit address space and accessed from real mode. 108253450Sjhb * This is used both to bounce arguments and for RTAS private data. 109189306Sjhb * 110189306Sjhb * It must be 4KB-aligned and not cross a 256 MB boundary. 111201279Sjhb */ 112201279Sjhb 11391355Simp OF_getprop(rtas, "rtas-size", &rtas_size, sizeof(rtas_size)); 11491355Simp rtas_size = round_page(rtas_size); 11591355Simp rtas_bounce_virt = contigmalloc(rtas_size + PAGE_SIZE, M_RTAS, 0, 0, 116172394Smarius ulmin(platform_real_maxaddr(), BUS_SPACE_MAXADDR_32BIT), 11792233Simp 4096, 256*1024*1024); 11891355Simp 11991355Simp rtas_private_data = vtophys(rtas_bounce_virt); 120330938Sjhb rtas_bounce_virt += rtas_size; /* Actual bounce area */ 121252315Sjhb rtas_bounce_phys = vtophys(rtas_bounce_virt); 122111056Simp rtas_bounce_size = PAGE_SIZE; 123111056Simp 124111056Simp /* 125111056Simp * Instantiate RTAS. We always use the 32-bit version. 126117115Stmm */ 127120155Siwasaki 128128058Simp result = OF_call_method("instantiate-rtas", rtasi, 1, 1, 129257495Skib (cell_t)rtas_private_data, &rtas_ptr); 130292907Sngie OF_close(rtasi); 131169615Simp 132169615Simp if (result != 0) { 133169615Simp rtas = 0; 134169615Simp rtas_ptr = 0; 135169615Simp printf("Error initializing RTAS (%d)\n", result); 136169615Simp return; 137142735Simp } 138169615Simp 139169615Simp rtas_entry = (uintptr_t)(rtas_ptr); 140169615Simp} 141169615Simp 142142735Simpstatic cell_t 143164067Sjhbrtas_real_map(const void *buf, size_t len) 14491355Simp{ 145 cell_t phys; 146 147 mtx_assert(&rtas_mtx, MA_OWNED); 148 149 /* 150 * Make sure the bounce page offset satisfies any reasonable 151 * alignment constraint. 152 */ 153 rtas_bounce_offset += sizeof(register_t) - 154 (rtas_bounce_offset % sizeof(register_t)); 155 156 if (rtas_bounce_offset + len > rtas_bounce_size) { 157 panic("Oversize RTAS call!"); 158 return 0; 159 } 160 161 if (buf != NULL) 162 memcpy(rtas_bounce_virt + rtas_bounce_offset, buf, len); 163 else 164 return (0); 165 166 phys = rtas_bounce_phys + rtas_bounce_offset; 167 rtas_bounce_offset += len; 168 169 return (phys); 170} 171 172static void 173rtas_real_unmap(cell_t physaddr, void *buf, size_t len) 174{ 175 mtx_assert(&rtas_mtx, MA_OWNED); 176 177 if (physaddr == 0) 178 return; 179 180 memcpy(buf, rtas_bounce_virt + (physaddr - rtas_bounce_phys), len); 181} 182 183/* Check if we have RTAS */ 184int 185rtas_exists(void) 186{ 187 return (rtas != 0); 188} 189 190/* Call an RTAS method by token */ 191int 192rtas_call_method(cell_t token, int nargs, int nreturns, ...) 193{ 194 vm_offset_t argsptr; 195 faultbuf env; 196 va_list ap; 197 struct { 198 cell_t token; 199 cell_t nargs; 200 cell_t nreturns; 201 cell_t args_n_results[12]; 202 } args; 203 int n, result; 204 205 if (!rtas_exists() || nargs + nreturns > 12) 206 return (-1); 207 208 args.token = token; 209 va_start(ap, nreturns); 210 211 mtx_lock(&rtas_mtx); 212 rtas_bounce_offset = 0; 213 214 args.nargs = nargs; 215 args.nreturns = nreturns; 216 217 for (n = 0; n < nargs; n++) 218 args.args_n_results[n] = va_arg(ap, cell_t); 219 220 argsptr = rtas_real_map(&args, sizeof(args)); 221 222 /* Get rid of any stale machine checks that have been waiting. */ 223 __asm __volatile ("sync; isync"); 224 if (!setfault(env)) { 225 __asm __volatile ("sync"); 226 result = rtascall(argsptr, rtas_private_data); 227 __asm __volatile ("sync; isync"); 228 } else { 229 result = RTAS_HW_ERROR; 230 } 231 curthread->td_pcb->pcb_onfault = 0; 232 __asm __volatile ("sync"); 233 234 rtas_real_unmap(argsptr, &args, sizeof(args)); 235 mtx_unlock(&rtas_mtx); 236 237 if (result < 0) 238 return (result); 239 240 for (n = nargs; n < nargs + nreturns; n++) 241 *va_arg(ap, cell_t *) = args.args_n_results[n]; 242 return (result); 243} 244 245/* Look up an RTAS token */ 246cell_t 247rtas_token_lookup(const char *method) 248{ 249 cell_t token; 250 251 if (!rtas_exists()) 252 return (-1); 253 254 if (OF_getprop(rtas, method, &token, sizeof(token)) == -1) 255 return (-1); 256 257 return (token); 258} 259 260 261