| /* |
| * This file contains the generic code to perform a call to the |
| * pSeries LPAR hypervisor. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| #include <asm/hvcall.h> |
| #include <asm/processor.h> |
| #include <asm/ppc_asm.h> |
| #include <asm/asm-offsets.h> |
| |
| #define STK_PARM(i) (48 + ((i)-3)*8) |
| |
| #ifdef CONFIG_TRACEPOINTS |
| |
| .section ".toc","aw" |
| |
| .globl hcall_tracepoint_refcount |
| hcall_tracepoint_refcount: |
| .llong 0 |
| |
| .section ".text" |
| |
| /* |
| * precall must preserve all registers. use unused STK_PARM() |
| * areas to save snapshots and opcode. We branch around this |
| * in early init (eg when populating the MMU hashtable) by using an |
| * unconditional cpu feature. |
| */ |
| #define HCALL_INST_PRECALL(FIRST_REG) \ |
| BEGIN_FTR_SECTION; \ |
| b 1f; \ |
| END_FTR_SECTION(0, 1); \ |
| ld r12,hcall_tracepoint_refcount@toc(r2); \ |
| cmpdi r12,0; \ |
| beq+ 1f; \ |
| mflr r0; \ |
| std r3,STK_PARM(r3)(r1); \ |
| std r4,STK_PARM(r4)(r1); \ |
| std r5,STK_PARM(r5)(r1); \ |
| std r6,STK_PARM(r6)(r1); \ |
| std r7,STK_PARM(r7)(r1); \ |
| std r8,STK_PARM(r8)(r1); \ |
| std r9,STK_PARM(r9)(r1); \ |
| std r10,STK_PARM(r10)(r1); \ |
| std r0,16(r1); \ |
| addi r4,r1,STK_PARM(FIRST_REG); \ |
| stdu r1,-STACK_FRAME_OVERHEAD(r1); \ |
| bl .__trace_hcall_entry; \ |
| addi r1,r1,STACK_FRAME_OVERHEAD; \ |
| ld r0,16(r1); \ |
| ld r3,STK_PARM(r3)(r1); \ |
| ld r4,STK_PARM(r4)(r1); \ |
| ld r5,STK_PARM(r5)(r1); \ |
| ld r6,STK_PARM(r6)(r1); \ |
| ld r7,STK_PARM(r7)(r1); \ |
| ld r8,STK_PARM(r8)(r1); \ |
| ld r9,STK_PARM(r9)(r1); \ |
| ld r10,STK_PARM(r10)(r1); \ |
| mtlr r0; \ |
| 1: |
| |
| /* |
| * postcall is performed immediately before function return which |
| * allows liberal use of volatile registers. We branch around this |
| * in early init (eg when populating the MMU hashtable) by using an |
| * unconditional cpu feature. |
| */ |
| #define __HCALL_INST_POSTCALL \ |
| BEGIN_FTR_SECTION; \ |
| b 1f; \ |
| END_FTR_SECTION(0, 1); \ |
| ld r12,hcall_tracepoint_refcount@toc(r2); \ |
| cmpdi r12,0; \ |
| beq+ 1f; \ |
| mflr r0; \ |
| ld r6,STK_PARM(r3)(r1); \ |
| std r3,STK_PARM(r3)(r1); \ |
| mr r4,r3; \ |
| mr r3,r6; \ |
| std r0,16(r1); \ |
| stdu r1,-STACK_FRAME_OVERHEAD(r1); \ |
| bl .__trace_hcall_exit; \ |
| addi r1,r1,STACK_FRAME_OVERHEAD; \ |
| ld r0,16(r1); \ |
| ld r3,STK_PARM(r3)(r1); \ |
| mtlr r0; \ |
| 1: |
| |
| #define HCALL_INST_POSTCALL_NORETS \ |
| li r5,0; \ |
| __HCALL_INST_POSTCALL |
| |
| #define HCALL_INST_POSTCALL(BUFREG) \ |
| mr r5,BUFREG; \ |
| __HCALL_INST_POSTCALL |
| |
| #else |
| #define HCALL_INST_PRECALL(FIRST_ARG) |
| #define HCALL_INST_POSTCALL_NORETS |
| #define HCALL_INST_POSTCALL(BUFREG) |
| #endif |
| |
| .text |
| |
| _GLOBAL(plpar_hcall_norets) |
| HMT_MEDIUM |
| |
| mfcr r0 |
| stw r0,8(r1) |
| |
| HCALL_INST_PRECALL(r4) |
| |
| HVSC /* invoke the hypervisor */ |
| |
| HCALL_INST_POSTCALL_NORETS |
| |
| lwz r0,8(r1) |
| mtcrf 0xff,r0 |
| blr /* return r3 = status */ |
| |
| _GLOBAL(plpar_hcall) |
| HMT_MEDIUM |
| |
| mfcr r0 |
| stw r0,8(r1) |
| |
| HCALL_INST_PRECALL(r5) |
| |
| std r4,STK_PARM(r4)(r1) /* Save ret buffer */ |
| |
| mr r4,r5 |
| mr r5,r6 |
| mr r6,r7 |
| mr r7,r8 |
| mr r8,r9 |
| mr r9,r10 |
| |
| HVSC /* invoke the hypervisor */ |
| |
| ld r12,STK_PARM(r4)(r1) |
| std r4, 0(r12) |
| std r5, 8(r12) |
| std r6, 16(r12) |
| std r7, 24(r12) |
| |
| HCALL_INST_POSTCALL(r12) |
| |
| lwz r0,8(r1) |
| mtcrf 0xff,r0 |
| |
| blr /* return r3 = status */ |
| |
| /* |
| * plpar_hcall_raw can be called in real mode. kexec/kdump need some |
| * hypervisor calls to be executed in real mode. So plpar_hcall_raw |
| * does not access the per cpu hypervisor call statistics variables, |
| * since these variables may not be present in the RMO region. |
| */ |
| _GLOBAL(plpar_hcall_raw) |
| HMT_MEDIUM |
| |
| mfcr r0 |
| stw r0,8(r1) |
| |
| std r4,STK_PARM(r4)(r1) /* Save ret buffer */ |
| |
| mr r4,r5 |
| mr r5,r6 |
| mr r6,r7 |
| mr r7,r8 |
| mr r8,r9 |
| mr r9,r10 |
| |
| HVSC /* invoke the hypervisor */ |
| |
| ld r12,STK_PARM(r4)(r1) |
| std r4, 0(r12) |
| std r5, 8(r12) |
| std r6, 16(r12) |
| std r7, 24(r12) |
| |
| lwz r0,8(r1) |
| mtcrf 0xff,r0 |
| |
| blr /* return r3 = status */ |
| |
| _GLOBAL(plpar_hcall9) |
| HMT_MEDIUM |
| |
| mfcr r0 |
| stw r0,8(r1) |
| |
| HCALL_INST_PRECALL(r5) |
| |
| std r4,STK_PARM(r4)(r1) /* Save ret buffer */ |
| |
| mr r4,r5 |
| mr r5,r6 |
| mr r6,r7 |
| mr r7,r8 |
| mr r8,r9 |
| mr r9,r10 |
| ld r10,STK_PARM(r11)(r1) /* put arg7 in R10 */ |
| ld r11,STK_PARM(r12)(r1) /* put arg8 in R11 */ |
| ld r12,STK_PARM(r13)(r1) /* put arg9 in R12 */ |
| |
| HVSC /* invoke the hypervisor */ |
| |
| mr r0,r12 |
| ld r12,STK_PARM(r4)(r1) |
| std r4, 0(r12) |
| std r5, 8(r12) |
| std r6, 16(r12) |
| std r7, 24(r12) |
| std r8, 32(r12) |
| std r9, 40(r12) |
| std r10,48(r12) |
| std r11,56(r12) |
| std r0, 64(r12) |
| |
| HCALL_INST_POSTCALL(r12) |
| |
| lwz r0,8(r1) |
| mtcrf 0xff,r0 |
| |
| blr /* return r3 = status */ |
