/* * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 2000 Hewlett Packard (Paul Bame bame@puffin.external.hp.com) * */ #include <asm/pdc.h> #include <asm/psw.h> #include <asm/assembly.h> #include <asm/asm-offsets.h> #include <linux/linkage.h> .export real_stack .export real64_stack __PAGE_ALIGNED_BSS real_stack: real64_stack: .block 8192 #define N_SAVED_REGS 9 .section .bss save_cr_space: .block REG_SZ * N_SAVED_REGS save_cr_end: /************************ 32-bit real-mode calls ***********************/ /* This can be called in both narrow and wide kernels */ .text /* unsigned long real32_call_asm(unsigned int *sp, * unsigned int *arg0p, * unsigned int iodc_fn) * sp is value of stack pointer to adopt before calling PDC (virt) * arg0p points to where saved arg values may be found * iodc_fn is the IODC function to call */ ENTRY_CFI(real32_call_asm) STREG %rp, -RP_OFFSET(%sp) /* save RP */ #ifdef CONFIG_64BIT callee_save ldo 2*REG_SZ(%sp), %sp /* room for a couple more saves */ STREG %r27, -1*REG_SZ(%sp) STREG %r29, -2*REG_SZ(%sp) #endif STREG %sp, -REG_SZ(%arg0) /* save SP on real-mode stack */ copy %arg0, %sp /* adopt the real-mode SP */ /* save iodc_fn */ copy %arg2, %r31 /* load up the arg registers from the saved arg area */ /* 32-bit calling convention passes first 4 args in registers */ ldw 0(%arg1), %arg0 /* note overwriting arg0 */ ldw -8(%arg1), %arg2 ldw -12(%arg1), %arg3 ldw -4(%arg1), %arg1 /* obviously must do this one last! */ tophys_r1 %sp b,l rfi_virt2real,%r2 nop b,l save_control_regs,%r2 /* modifies r1, r2, r28 */ nop #ifdef CONFIG_64BIT rsm PSW_SM_W, %r0 /* go narrow */ #endif load32 PA(ric_ret), %r2 bv 0(%r31) nop ric_ret: #ifdef CONFIG_64BIT ssm PSW_SM_W, %r0 /* go wide */ #endif /* restore CRs before going virtual in case we page fault */ b,l restore_control_regs, %r2 /* modifies r1, r2, r26 */ nop b,l rfi_real2virt,%r2 nop tovirt_r1 %sp LDREG -REG_SZ(%sp), %sp /* restore SP */ #ifdef CONFIG_64BIT LDREG -1*REG_SZ(%sp), %r27 LDREG -2*REG_SZ(%sp), %r29 ldo -2*REG_SZ(%sp), %sp callee_rest #endif LDREG -RP_OFFSET(%sp), %rp /* restore RP */ bv 0(%rp) nop ENDPROC_CFI(real32_call_asm) # define PUSH_CR(r, where) mfctl r, %r1 ! STREG,ma %r1, REG_SZ(where) # define POP_CR(r, where) LDREG,mb -REG_SZ(where), %r1 ! mtctl %r1, r .text ENTRY_CFI(save_control_regs) load32 PA(save_cr_space), %r28 PUSH_CR(%cr24, %r28) PUSH_CR(%cr25, %r28) PUSH_CR(%cr26, %r28) PUSH_CR(%cr27, %r28) PUSH_CR(%cr28, %r28) PUSH_CR(%cr29, %r28) PUSH_CR(%cr30, %r28) PUSH_CR(%cr31, %r28) PUSH_CR(%cr15, %r28) bv 0(%r2) nop ENDPROC_CFI(save_control_regs) ENTRY_CFI(restore_control_regs) load32 PA(save_cr_end), %r26 POP_CR(%cr15, %r26) POP_CR(%cr31, %r26) POP_CR(%cr30, %r26) POP_CR(%cr29, %r26) POP_CR(%cr28, %r26) POP_CR(%cr27, %r26) POP_CR(%cr26, %r26) POP_CR(%cr25, %r26) POP_CR(%cr24, %r26) bv 0(%r2) nop ENDPROC_CFI(restore_control_regs) /* rfi_virt2real() and rfi_real2virt() could perhaps be adapted for * more general-purpose use by the several places which need RFIs */ .text .align 128 ENTRY_CFI(rfi_virt2real) #if !defined(BOOTLOADER) /* switch to real mode... */ rsm PSW_SM_I,%r0 load32 PA(rfi_v2r_1), %r1 nop nop nop nop nop rsm PSW_SM_Q,%r0 /* disable Q & I bits to load iia queue */ mtctl %r0, %cr17 /* Clear IIASQ tail */ mtctl %r0, %cr17 /* Clear IIASQ head */ mtctl %r1, %cr18 /* IIAOQ head */ ldo 4(%r1), %r1 mtctl %r1, %cr18 /* IIAOQ tail */ load32 REAL_MODE_PSW, %r1 mtctl %r1, %cr22 rfi nop nop nop nop nop nop nop nop rfi_v2r_1: tophys_r1 %r2 #endif /* defined(BOOTLOADER) */ bv 0(%r2) nop ENDPROC_CFI(rfi_virt2real) .text .align 128 ENTRY_CFI(rfi_real2virt) #if !defined(BOOTLOADER) rsm PSW_SM_I,%r0 load32 (rfi_r2v_1), %r1 nop nop nop nop nop rsm PSW_SM_Q,%r0 /* disable Q bit to load iia queue */ mtctl %r0, %cr17 /* Clear IIASQ tail */ mtctl %r0, %cr17 /* Clear IIASQ head */ mtctl %r1, %cr18 /* IIAOQ head */ ldo 4(%r1), %r1 mtctl %r1, %cr18 /* IIAOQ tail */ load32 KERNEL_PSW, %r1 mtctl %r1, %cr22 rfi nop nop nop nop nop nop nop nop rfi_r2v_1: tovirt_r1 %r2 #endif /* defined(BOOTLOADER) */ bv 0(%r2) nop ENDPROC_CFI(rfi_real2virt) #ifdef CONFIG_64BIT /************************ 64-bit real-mode calls ***********************/ /* This is only usable in wide kernels right now and will probably stay so */ .text /* unsigned long real64_call_asm(unsigned long *sp, * unsigned long *arg0p, * unsigned long fn) * sp is value of stack pointer to adopt before calling PDC (virt) * arg0p points to where saved arg values may be found * iodc_fn is the IODC function to call */ ENTRY_CFI(real64_call_asm) std %rp, -0x10(%sp) /* save RP */ std %sp, -8(%arg0) /* save SP on real-mode stack */ copy %arg0, %sp /* adopt the real-mode SP */ /* save fn */ copy %arg2, %r31 /* load up the arg registers from the saved arg area */ /* 32-bit calling convention passes first 4 args in registers */ ldd 0*REG_SZ(%arg1), %arg0 /* note overwriting arg0 */ ldd 2*REG_SZ(%arg1), %arg2 ldd 3*REG_SZ(%arg1), %arg3 ldd 4*REG_SZ(%arg1), %r22 ldd 5*REG_SZ(%arg1), %r21 ldd 6*REG_SZ(%arg1), %r20 ldd 7*REG_SZ(%arg1), %r19 ldd 1*REG_SZ(%arg1), %arg1 /* do this one last! */ /* set up real-mode stack and real-mode ap */ tophys_r1 %sp ldo -16(%sp), %r29 /* Reference param save area */ b,l rfi_virt2real,%r2 nop b,l save_control_regs,%r2 /* modifies r1, r2, r28 */ nop load32 PA(r64_ret), %r2 bv 0(%r31) nop r64_ret: /* restore CRs before going virtual in case we page fault */ b,l restore_control_regs, %r2 /* modifies r1, r2, r26 */ nop b,l rfi_real2virt,%r2 nop tovirt_r1 %sp ldd -8(%sp), %sp /* restore SP */ ldd -0x10(%sp), %rp /* restore RP */ bv 0(%rp) nop ENDPROC_CFI(real64_call_asm) #endif .text /* http://lists.parisc-linux.org/hypermail/parisc-linux/10916.html ** GCC 3.3 and later has a new function in libgcc.a for ** comparing function pointers. */ ENTRY_CFI(__canonicalize_funcptr_for_compare) #ifdef CONFIG_64BIT bve (%r2) #else bv %r0(%r2) #endif copy %r26,%r28 ENDPROC_CFI(__canonicalize_funcptr_for_compare)