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
7 * Copyright (C) 2000 Hewlett Packard (Paul Bame bame@puffin.external.hp.com)
10 #include <asm/assembly.h>
25 #define N_SAVED_REGS 9
28 .block REG_SZ * N_SAVED_REGS
32 /************************ 32-bit real-mode calls ***********************/
33 /* This can be called in both narrow and wide kernels */
37 .export real32_call_asm
39 /* unsigned long real32_call_asm(unsigned int *sp,
40 * unsigned int *arg0p,
41 * unsigned int iodc_fn)
42 * sp is value of stack pointer to adopt before calling PDC (virt)
43 * arg0p points to where saved arg values may be found
44 * iodc_fn is the IODC function to call
48 STREG %rp, -RP_OFFSET(%sp) /* save RP */
51 ldo 2*REG_SZ(%sp), %sp /* room for a couple more saves */
52 STREG %r27, -1*REG_SZ(%sp)
53 STREG %r29, -2*REG_SZ(%sp)
55 STREG %sp, -REG_SZ(%arg0) /* save SP on real-mode stack */
56 copy %arg0, %sp /* adopt the real-mode SP */
61 /* load up the arg registers from the saved arg area */
62 /* 32-bit calling convention passes first 4 args in registers */
63 ldw 0(%arg1), %arg0 /* note overwriting arg0 */
66 ldw -4(%arg1), %arg1 /* obviously must do this one last! */
73 b,l save_control_regs,%r2 /* modifies r1, r2, r28 */
77 rsm PSW_SM_W, %r0 /* go narrow */
80 ldil L%PA(ric_ret), %r2
81 ldo R%PA(ric_ret)(%r2), %r2
86 ssm PSW_SM_W, %r0 /* go wide */
88 /* restore CRs before going virtual in case we page fault */
89 b,l restore_control_regs, %r2 /* modifies r1, r2, r26 */
96 LDREG -REG_SZ(%sp), %sp /* restore SP */
98 LDREG -1*REG_SZ(%sp), %r27
99 LDREG -2*REG_SZ(%sp), %r29
100 ldo -2*REG_SZ(%sp), %sp
103 LDREG -RP_OFFSET(%sp), %rp /* restore RP */
108 # define PUSH_CR(r, where) mfctl r, %r1 ! STREG,ma %r1, REG_SZ(where)
109 # define POP_CR(r, where) LDREG,mb -REG_SZ(where), %r1 ! mtctl %r1, r
113 load32 PA(save_cr_space), %r28
126 restore_control_regs:
127 load32 PA(save_cr_end), %r26
140 /* rfi_virt2real() and rfi_real2virt() could perhaps be adapted for
141 * more general-purpose use by the several places which need RFIs
146 /* switch to real mode... */
147 ssm 0,0 /* See "relied upon translation" */
148 nop /* comment in interruption.S */
157 rsm (PSW_SM_Q|PSW_SM_I),%r0 /* disable Q & I bits to load iia queue */
158 mtctl %r0, %cr17 /* Clear IIASQ tail */
159 mtctl %r0, %cr17 /* Clear IIASQ head */
160 load32 PA(rfi_v2r_1), %r1
161 mtctl %r1, %cr18 /* IIAOQ head */
163 mtctl %r1, %cr18 /* IIAOQ tail */
164 load32 REAL_MODE_PSW, %r1
184 ssm 0,0 /* See "relied upon translation" */
185 nop /* comment in interruption.S */
194 rsm PSW_SM_Q,%r0 /* disable Q bit to load iia queue */
195 mtctl %r0, %cr17 /* Clear IIASQ tail */
196 mtctl %r0, %cr17 /* Clear IIASQ head */
197 load32 (rfi_r2v_1), %r1
198 mtctl %r1, %cr18 /* IIAOQ head */
200 mtctl %r1, %cr18 /* IIAOQ tail */
201 load32 KERNEL_PSW, %r1
220 /************************ 64-bit real-mode calls ***********************/
221 /* This is only usable in wide kernels right now and will probably stay so */
223 .export real64_call_asm
224 /* unsigned long real64_call_asm(unsigned long *sp,
225 * unsigned long *arg0p,
227 * sp is value of stack pointer to adopt before calling PDC (virt)
228 * arg0p points to where saved arg values may be found
229 * iodc_fn is the IODC function to call
232 std %rp, -0x10(%sp) /* save RP */
233 std %sp, -8(%arg0) /* save SP on real-mode stack */
234 copy %arg0, %sp /* adopt the real-mode SP */
239 /* set up the new ap */
242 /* load up the arg registers from the saved arg area */
243 /* 32-bit calling convention passes first 4 args in registers */
244 ldd 0*REG_SZ(%arg1), %arg0 /* note overwriting arg0 */
245 ldd 2*REG_SZ(%arg1), %arg2
246 ldd 3*REG_SZ(%arg1), %arg3
247 ldd 4*REG_SZ(%arg1), %r22
248 ldd 5*REG_SZ(%arg1), %r21
249 ldd 6*REG_SZ(%arg1), %r20
250 ldd 7*REG_SZ(%arg1), %r19
251 ldd 1*REG_SZ(%arg1), %arg1 /* do this one last! */
255 b,l rfi_virt2real,%r2
258 b,l save_control_regs,%r2 /* modifies r1, r2, r28 */
261 load32 PA(r64_ret), %r2
265 /* restore CRs before going virtual in case we page fault */
266 b,l restore_control_regs, %r2 /* modifies r1, r2, r26 */
269 b,l rfi_real2virt,%r2
273 ldd -8(%sp), %sp /* restore SP */
274 ldd -0x10(%sp), %rp /* restore RP */
280 .export pc_in_user_space
282 /* Doesn't belong here but I couldn't find a nicer spot. */
283 /* Should never get called, only used by profile stuff in time.c */
289 .export __canonicalize_funcptr_for_compare
291 /* http://lists.parisc-linux.org/hypermail/parisc-linux/10916.html
292 ** GCC 3.3 and later has a new function in libgcc.a for
293 ** comparing function pointers.
295 __canonicalize_funcptr_for_compare: