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59 lines
1.3 KiB
59 lines
1.3 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* Access to the shared data page by the vDSO & syscall map |
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* |
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* Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org), IBM Corp. |
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*/ |
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#include <asm/processor.h> |
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#include <asm/ppc_asm.h> |
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#include <asm/asm-offsets.h> |
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#include <asm/unistd.h> |
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#include <asm/vdso.h> |
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#include <asm/vdso_datapage.h> |
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.text |
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/* |
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* void *__kernel_get_syscall_map(unsigned int *syscall_count) ; |
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* |
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* returns a pointer to the syscall map. the map is agnostic to the |
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* size of "long", unlike kernel bitops, it stores bits from top to |
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* bottom so that memory actually contains a linear bitmap |
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* check for syscall N by testing bit (0x80000000 >> (N & 0x1f)) of |
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* 32 bits int at N >> 5. |
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*/ |
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V_FUNCTION_BEGIN(__kernel_get_syscall_map) |
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.cfi_startproc |
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mflr r12 |
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.cfi_register lr,r12 |
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mr r4,r3 |
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get_datapage r3 |
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mtlr r12 |
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addi r3,r3,CFG_SYSCALL_MAP64 |
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cmpldi cr0,r4,0 |
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crclr cr0*4+so |
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beqlr |
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li r0,NR_syscalls |
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stw r0,0(r4) |
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blr |
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.cfi_endproc |
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V_FUNCTION_END(__kernel_get_syscall_map) |
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/* |
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* void unsigned long __kernel_get_tbfreq(void); |
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* |
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* returns the timebase frequency in HZ |
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*/ |
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V_FUNCTION_BEGIN(__kernel_get_tbfreq) |
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.cfi_startproc |
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mflr r12 |
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.cfi_register lr,r12 |
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get_datapage r3 |
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ld r3,CFG_TB_TICKS_PER_SEC(r3) |
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mtlr r12 |
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crclr cr0*4+so |
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blr |
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.cfi_endproc |
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V_FUNCTION_END(__kernel_get_tbfreq)
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