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306 lines
6.4 KiB
306 lines
6.4 KiB
/* |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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* |
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* Copyright (C) 2000 Hewlett Packard (Paul Bame bame@puffin.external.hp.com) |
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* |
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*/ |
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#include <asm/pdc.h> |
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#include <asm/psw.h> |
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#include <asm/assembly.h> |
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#include <asm/asm-offsets.h> |
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#include <linux/linkage.h> |
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.section .bss |
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.export pdc_result |
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.export pdc_result2 |
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.align 8 |
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pdc_result: |
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.block ASM_PDC_RESULT_SIZE |
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pdc_result2: |
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.block ASM_PDC_RESULT_SIZE |
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.export real_stack |
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.export real32_stack |
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.export real64_stack |
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.align 64 |
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real_stack: |
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real32_stack: |
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real64_stack: |
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.block 8192 |
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#define N_SAVED_REGS 9 |
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save_cr_space: |
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.block REG_SZ * N_SAVED_REGS |
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save_cr_end: |
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/************************ 32-bit real-mode calls ***********************/ |
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/* This can be called in both narrow and wide kernels */ |
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.text |
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/* unsigned long real32_call_asm(unsigned int *sp, |
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* unsigned int *arg0p, |
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* unsigned int iodc_fn) |
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* sp is value of stack pointer to adopt before calling PDC (virt) |
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* arg0p points to where saved arg values may be found |
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* iodc_fn is the IODC function to call |
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*/ |
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ENTRY_CFI(real32_call_asm) |
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STREG %rp, -RP_OFFSET(%sp) /* save RP */ |
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#ifdef CONFIG_64BIT |
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callee_save |
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ldo 2*REG_SZ(%sp), %sp /* room for a couple more saves */ |
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STREG %r27, -1*REG_SZ(%sp) |
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STREG %r29, -2*REG_SZ(%sp) |
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#endif |
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STREG %sp, -REG_SZ(%arg0) /* save SP on real-mode stack */ |
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copy %arg0, %sp /* adopt the real-mode SP */ |
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/* save iodc_fn */ |
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copy %arg2, %r31 |
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/* load up the arg registers from the saved arg area */ |
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/* 32-bit calling convention passes first 4 args in registers */ |
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ldw 0(%arg1), %arg0 /* note overwriting arg0 */ |
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ldw -8(%arg1), %arg2 |
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ldw -12(%arg1), %arg3 |
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ldw -4(%arg1), %arg1 /* obviously must do this one last! */ |
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tophys_r1 %sp |
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b,l rfi_virt2real,%r2 |
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nop |
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b,l save_control_regs,%r2 /* modifies r1, r2, r28 */ |
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nop |
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#ifdef CONFIG_64BIT |
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rsm PSW_SM_W, %r0 /* go narrow */ |
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#endif |
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load32 PA(ric_ret), %r2 |
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bv 0(%r31) |
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nop |
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ric_ret: |
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#ifdef CONFIG_64BIT |
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ssm PSW_SM_W, %r0 /* go wide */ |
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#endif |
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/* restore CRs before going virtual in case we page fault */ |
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b,l restore_control_regs, %r2 /* modifies r1, r2, r26 */ |
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nop |
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b,l rfi_real2virt,%r2 |
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nop |
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tovirt_r1 %sp |
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LDREG -REG_SZ(%sp), %sp /* restore SP */ |
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#ifdef CONFIG_64BIT |
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LDREG -1*REG_SZ(%sp), %r27 |
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LDREG -2*REG_SZ(%sp), %r29 |
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ldo -2*REG_SZ(%sp), %sp |
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callee_rest |
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#endif |
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LDREG -RP_OFFSET(%sp), %rp /* restore RP */ |
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bv 0(%rp) |
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nop |
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ENDPROC_CFI(real32_call_asm) |
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# define PUSH_CR(r, where) mfctl r, %r1 ! STREG,ma %r1, REG_SZ(where) |
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# define POP_CR(r, where) LDREG,mb -REG_SZ(where), %r1 ! mtctl %r1, r |
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.text |
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ENTRY_CFI(save_control_regs) |
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load32 PA(save_cr_space), %r28 |
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PUSH_CR(%cr24, %r28) |
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PUSH_CR(%cr25, %r28) |
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PUSH_CR(%cr26, %r28) |
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PUSH_CR(%cr27, %r28) |
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PUSH_CR(%cr28, %r28) |
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PUSH_CR(%cr29, %r28) |
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PUSH_CR(%cr30, %r28) |
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PUSH_CR(%cr31, %r28) |
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PUSH_CR(%cr15, %r28) |
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bv 0(%r2) |
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nop |
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ENDPROC_CFI(save_control_regs) |
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ENTRY_CFI(restore_control_regs) |
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load32 PA(save_cr_end), %r26 |
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POP_CR(%cr15, %r26) |
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POP_CR(%cr31, %r26) |
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POP_CR(%cr30, %r26) |
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POP_CR(%cr29, %r26) |
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POP_CR(%cr28, %r26) |
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POP_CR(%cr27, %r26) |
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POP_CR(%cr26, %r26) |
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POP_CR(%cr25, %r26) |
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POP_CR(%cr24, %r26) |
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bv 0(%r2) |
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nop |
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ENDPROC_CFI(restore_control_regs) |
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/* rfi_virt2real() and rfi_real2virt() could perhaps be adapted for |
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* more general-purpose use by the several places which need RFIs |
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*/ |
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.text |
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.align 128 |
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ENTRY_CFI(rfi_virt2real) |
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#if !defined(BOOTLOADER) |
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/* switch to real mode... */ |
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rsm PSW_SM_I,%r0 |
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load32 PA(rfi_v2r_1), %r1 |
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nop |
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nop |
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nop |
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nop |
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nop |
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rsm PSW_SM_Q,%r0 /* disable Q & I bits to load iia queue */ |
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mtctl %r0, %cr17 /* Clear IIASQ tail */ |
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mtctl %r0, %cr17 /* Clear IIASQ head */ |
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mtctl %r1, %cr18 /* IIAOQ head */ |
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ldo 4(%r1), %r1 |
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mtctl %r1, %cr18 /* IIAOQ tail */ |
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load32 REAL_MODE_PSW, %r1 |
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mtctl %r1, %cr22 |
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rfi |
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nop |
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nop |
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nop |
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nop |
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nop |
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nop |
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nop |
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nop |
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rfi_v2r_1: |
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tophys_r1 %r2 |
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#endif /* defined(BOOTLOADER) */ |
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bv 0(%r2) |
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nop |
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ENDPROC_CFI(rfi_virt2real) |
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.text |
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.align 128 |
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ENTRY_CFI(rfi_real2virt) |
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#if !defined(BOOTLOADER) |
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rsm PSW_SM_I,%r0 |
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load32 (rfi_r2v_1), %r1 |
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nop |
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nop |
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nop |
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nop |
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nop |
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rsm PSW_SM_Q,%r0 /* disable Q bit to load iia queue */ |
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mtctl %r0, %cr17 /* Clear IIASQ tail */ |
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mtctl %r0, %cr17 /* Clear IIASQ head */ |
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mtctl %r1, %cr18 /* IIAOQ head */ |
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ldo 4(%r1), %r1 |
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mtctl %r1, %cr18 /* IIAOQ tail */ |
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load32 KERNEL_PSW, %r1 |
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mtctl %r1, %cr22 |
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rfi |
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nop |
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nop |
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nop |
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nop |
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nop |
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nop |
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nop |
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nop |
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rfi_r2v_1: |
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tovirt_r1 %r2 |
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#endif /* defined(BOOTLOADER) */ |
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bv 0(%r2) |
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nop |
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ENDPROC_CFI(rfi_real2virt) |
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#ifdef CONFIG_64BIT |
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/************************ 64-bit real-mode calls ***********************/ |
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/* This is only usable in wide kernels right now and will probably stay so */ |
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.text |
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/* unsigned long real64_call_asm(unsigned long *sp, |
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* unsigned long *arg0p, |
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* unsigned long fn) |
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* sp is value of stack pointer to adopt before calling PDC (virt) |
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* arg0p points to where saved arg values may be found |
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* iodc_fn is the IODC function to call |
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*/ |
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ENTRY_CFI(real64_call_asm) |
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std %rp, -0x10(%sp) /* save RP */ |
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std %sp, -8(%arg0) /* save SP on real-mode stack */ |
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copy %arg0, %sp /* adopt the real-mode SP */ |
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/* save fn */ |
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copy %arg2, %r31 |
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/* set up the new ap */ |
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ldo 64(%arg1), %r29 |
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/* load up the arg registers from the saved arg area */ |
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/* 32-bit calling convention passes first 4 args in registers */ |
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ldd 0*REG_SZ(%arg1), %arg0 /* note overwriting arg0 */ |
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ldd 2*REG_SZ(%arg1), %arg2 |
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ldd 3*REG_SZ(%arg1), %arg3 |
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ldd 4*REG_SZ(%arg1), %r22 |
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ldd 5*REG_SZ(%arg1), %r21 |
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ldd 6*REG_SZ(%arg1), %r20 |
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ldd 7*REG_SZ(%arg1), %r19 |
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ldd 1*REG_SZ(%arg1), %arg1 /* do this one last! */ |
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tophys_r1 %sp |
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b,l rfi_virt2real,%r2 |
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nop |
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b,l save_control_regs,%r2 /* modifies r1, r2, r28 */ |
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nop |
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load32 PA(r64_ret), %r2 |
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bv 0(%r31) |
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nop |
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r64_ret: |
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/* restore CRs before going virtual in case we page fault */ |
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b,l restore_control_regs, %r2 /* modifies r1, r2, r26 */ |
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nop |
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b,l rfi_real2virt,%r2 |
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nop |
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tovirt_r1 %sp |
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ldd -8(%sp), %sp /* restore SP */ |
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ldd -0x10(%sp), %rp /* restore RP */ |
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bv 0(%rp) |
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nop |
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ENDPROC_CFI(real64_call_asm) |
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#endif |
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.text |
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/* http://lists.parisc-linux.org/hypermail/parisc-linux/10916.html |
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** GCC 3.3 and later has a new function in libgcc.a for |
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** comparing function pointers. |
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*/ |
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ENTRY_CFI(__canonicalize_funcptr_for_compare) |
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#ifdef CONFIG_64BIT |
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bve (%r2) |
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#else |
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bv %r0(%r2) |
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#endif |
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copy %r26,%r28 |
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ENDPROC_CFI(__canonicalize_funcptr_for_compare) |
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