1/* 2 * 3 * This file is subject to the terms and conditions of the GNU General Public 4 * License. See the file "COPYING" in the main directory of this archive 5 * for more details. 6 * 7 * Copyright (C) 2000 Hewlett Packard (Paul Bame bame@puffin.external.hp.com) 8 * 9 */ 10 11#include <asm/pdc.h> 12#include <asm/psw.h> 13#include <asm/assembly.h> 14#include <asm/asm-offsets.h> 15 16#include <linux/linkage.h> 17 18 19 .section .bss 20 21 .export pdc_result 22 .export pdc_result2 23 .align 8 24pdc_result: 25 .block ASM_PDC_RESULT_SIZE 26pdc_result2: 27 .block ASM_PDC_RESULT_SIZE 28 29 .export real_stack 30 .export real32_stack 31 .export real64_stack 32 .align 64 33real_stack: 34real32_stack: 35real64_stack: 36 .block 8192 37 38#ifdef CONFIG_64BIT 39# define REG_SZ 8 40#else 41# define REG_SZ 4 42#endif 43 44#define N_SAVED_REGS 9 45 46save_cr_space: 47 .block REG_SZ * N_SAVED_REGS 48save_cr_end: 49 50 51/************************ 32-bit real-mode calls ***********************/ 52/* This can be called in both narrow and wide kernels */ 53 54 .text 55 56 /* unsigned long real32_call_asm(unsigned int *sp, 57 * unsigned int *arg0p, 58 * unsigned int iodc_fn) 59 * sp is value of stack pointer to adopt before calling PDC (virt) 60 * arg0p points to where saved arg values may be found 61 * iodc_fn is the IODC function to call 62 */ 63 64ENTRY(real32_call_asm) 65 STREG %rp, -RP_OFFSET(%sp) /* save RP */ 66#ifdef CONFIG_64BIT 67 callee_save 68 ldo 2*REG_SZ(%sp), %sp /* room for a couple more saves */ 69 STREG %r27, -1*REG_SZ(%sp) 70 STREG %r29, -2*REG_SZ(%sp) 71#endif 72 STREG %sp, -REG_SZ(%arg0) /* save SP on real-mode stack */ 73 copy %arg0, %sp /* adopt the real-mode SP */ 74 75 /* save iodc_fn */ 76 copy %arg2, %r31 77 78 /* load up the arg registers from the saved arg area */ 79 /* 32-bit calling convention passes first 4 args in registers */ 80 ldw 0(%arg1), %arg0 /* note overwriting arg0 */ 81 ldw -8(%arg1), %arg2 82 ldw -12(%arg1), %arg3 83 ldw -4(%arg1), %arg1 /* obviously must do this one last! */ 84 85 tophys_r1 %sp 86 87 b,l rfi_virt2real,%r2 88 nop 89 90 b,l save_control_regs,%r2 /* modifies r1, r2, r28 */ 91 nop 92 93#ifdef CONFIG_64BIT 94 rsm PSW_SM_W, %r0 /* go narrow */ 95#endif 96 97 load32 PA(ric_ret), %r2 98 bv 0(%r31) 99 nop 100ric_ret: 101#ifdef CONFIG_64BIT 102 ssm PSW_SM_W, %r0 /* go wide */ 103#endif 104 /* restore CRs before going virtual in case we page fault */ 105 b,l restore_control_regs, %r2 /* modifies r1, r2, r26 */ 106 nop 107 108 b,l rfi_real2virt,%r2 109 nop 110 111 tovirt_r1 %sp 112 LDREG -REG_SZ(%sp), %sp /* restore SP */ 113#ifdef CONFIG_64BIT 114 LDREG -1*REG_SZ(%sp), %r27 115 LDREG -2*REG_SZ(%sp), %r29 116 ldo -2*REG_SZ(%sp), %sp 117 callee_rest 118#endif 119 LDREG -RP_OFFSET(%sp), %rp /* restore RP */ 120 bv 0(%rp) 121 nop 122ENDPROC(real32_call_asm) 123 124 125# define PUSH_CR(r, where) mfctl r, %r1 ! STREG,ma %r1, REG_SZ(where) 126# define POP_CR(r, where) LDREG,mb -REG_SZ(where), %r1 ! mtctl %r1, r 127 128 .text 129save_control_regs: 130 load32 PA(save_cr_space), %r28 131 PUSH_CR(%cr24, %r28) 132 PUSH_CR(%cr25, %r28) 133 PUSH_CR(%cr26, %r28) 134 PUSH_CR(%cr27, %r28) 135 PUSH_CR(%cr28, %r28) 136 PUSH_CR(%cr29, %r28) 137 PUSH_CR(%cr30, %r28) 138 PUSH_CR(%cr31, %r28) 139 PUSH_CR(%cr15, %r28) 140 bv 0(%r2) 141 nop 142 143restore_control_regs: 144 load32 PA(save_cr_end), %r26 145 POP_CR(%cr15, %r26) 146 POP_CR(%cr31, %r26) 147 POP_CR(%cr30, %r26) 148 POP_CR(%cr29, %r26) 149 POP_CR(%cr28, %r26) 150 POP_CR(%cr27, %r26) 151 POP_CR(%cr26, %r26) 152 POP_CR(%cr25, %r26) 153 POP_CR(%cr24, %r26) 154 bv 0(%r2) 155 nop 156 157/* rfi_virt2real() and rfi_real2virt() could perhaps be adapted for 158 * more general-purpose use by the several places which need RFIs 159 */ 160 .text 161 .align 128 162rfi_virt2real: 163 /* switch to real mode... */ 164 rsm PSW_SM_I,%r0 165 load32 PA(rfi_v2r_1), %r1 166 nop 167 nop 168 nop 169 nop 170 nop 171 172 rsm PSW_SM_Q,%r0 /* disable Q & I bits to load iia queue */ 173 mtctl %r0, %cr17 /* Clear IIASQ tail */ 174 mtctl %r0, %cr17 /* Clear IIASQ head */ 175 mtctl %r1, %cr18 /* IIAOQ head */ 176 ldo 4(%r1), %r1 177 mtctl %r1, %cr18 /* IIAOQ tail */ 178 load32 REAL_MODE_PSW, %r1 179 mtctl %r1, %cr22 180 rfi 181 182 nop 183 nop 184 nop 185 nop 186 nop 187 nop 188 nop 189 nop 190rfi_v2r_1: 191 tophys_r1 %r2 192 bv 0(%r2) 193 nop 194 195 .text 196 .align 128 197rfi_real2virt: 198 rsm PSW_SM_I,%r0 199 load32 (rfi_r2v_1), %r1 200 nop 201 nop 202 nop 203 nop 204 nop 205 206 rsm PSW_SM_Q,%r0 /* disable Q bit to load iia queue */ 207 mtctl %r0, %cr17 /* Clear IIASQ tail */ 208 mtctl %r0, %cr17 /* Clear IIASQ head */ 209 mtctl %r1, %cr18 /* IIAOQ head */ 210 ldo 4(%r1), %r1 211 mtctl %r1, %cr18 /* IIAOQ tail */ 212 load32 KERNEL_PSW, %r1 213 mtctl %r1, %cr22 214 rfi 215 216 nop 217 nop 218 nop 219 nop 220 nop 221 nop 222 nop 223 nop 224rfi_r2v_1: 225 tovirt_r1 %r2 226 bv 0(%r2) 227 nop 228 229#ifdef CONFIG_64BIT 230 231/************************ 64-bit real-mode calls ***********************/ 232/* This is only usable in wide kernels right now and will probably stay so */ 233 .text 234 /* unsigned long real64_call_asm(unsigned long *sp, 235 * unsigned long *arg0p, 236 * unsigned long fn) 237 * sp is value of stack pointer to adopt before calling PDC (virt) 238 * arg0p points to where saved arg values may be found 239 * iodc_fn is the IODC function to call 240 */ 241ENTRY(real64_call_asm) 242 std %rp, -0x10(%sp) /* save RP */ 243 std %sp, -8(%arg0) /* save SP on real-mode stack */ 244 copy %arg0, %sp /* adopt the real-mode SP */ 245 246 /* save fn */ 247 copy %arg2, %r31 248 249 /* set up the new ap */ 250 ldo 64(%arg1), %r29 251 252 /* load up the arg registers from the saved arg area */ 253 /* 32-bit calling convention passes first 4 args in registers */ 254 ldd 0*REG_SZ(%arg1), %arg0 /* note overwriting arg0 */ 255 ldd 2*REG_SZ(%arg1), %arg2 256 ldd 3*REG_SZ(%arg1), %arg3 257 ldd 4*REG_SZ(%arg1), %r22 258 ldd 5*REG_SZ(%arg1), %r21 259 ldd 6*REG_SZ(%arg1), %r20 260 ldd 7*REG_SZ(%arg1), %r19 261 ldd 1*REG_SZ(%arg1), %arg1 /* do this one last! */ 262 263 tophys_r1 %sp 264 265 b,l rfi_virt2real,%r2 266 nop 267 268 b,l save_control_regs,%r2 /* modifies r1, r2, r28 */ 269 nop 270 271 load32 PA(r64_ret), %r2 272 bv 0(%r31) 273 nop 274r64_ret: 275 /* restore CRs before going virtual in case we page fault */ 276 b,l restore_control_regs, %r2 /* modifies r1, r2, r26 */ 277 nop 278 279 b,l rfi_real2virt,%r2 280 nop 281 282 tovirt_r1 %sp 283 ldd -8(%sp), %sp /* restore SP */ 284 ldd -0x10(%sp), %rp /* restore RP */ 285 bv 0(%rp) 286 nop 287ENDPROC(real64_call_asm) 288 289#endif 290 291 .text 292 /* http://lists.parisc-linux.org/hypermail/parisc-linux/10916.html 293 ** GCC 3.3 and later has a new function in libgcc.a for 294 ** comparing function pointers. 295 */ 296ENTRY(__canonicalize_funcptr_for_compare) 297#ifdef CONFIG_64BIT 298 bve (%r2) 299#else 300 bv %r0(%r2) 301#endif 302 copy %r26,%r28 303ENDPROC(__canonicalize_funcptr_for_compare) 304 305