1/* SPDX-License-Identifier: GPL-2.0-or-later */ 2/* 3 * Access to the shared data page by the vDSO & syscall map 4 * 5 * Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org), IBM Corp. 6 */ 7 8#include <asm/processor.h> 9#include <asm/ppc_asm.h> 10#include <asm/asm-offsets.h> 11#include <asm/unistd.h> 12#include <asm/vdso.h> 13#include <asm/vdso_datapage.h> 14 15 .text 16 17/* 18 * void *__kernel_get_syscall_map(unsigned int *syscall_count) ; 19 * 20 * returns a pointer to the syscall map. the map is agnostic to the 21 * size of "long", unlike kernel bitops, it stores bits from top to 22 * bottom so that memory actually contains a linear bitmap 23 * check for syscall N by testing bit (0x80000000 >> (N & 0x1f)) of 24 * 32 bits int at N >> 5. 25 */ 26V_FUNCTION_BEGIN(__kernel_get_syscall_map) 27 .cfi_startproc 28 mflr r12 29 .cfi_register lr,r12 30 mr. r4,r3 31 get_datapage r3 32 mtlr r12 33#ifdef __powerpc64__ 34 addi r3,r3,CFG_SYSCALL_MAP64 35#else 36 addi r3,r3,CFG_SYSCALL_MAP32 37#endif 38 crclr cr0*4+so 39 beqlr 40 li r0,NR_syscalls 41 stw r0,0(r4) 42 blr 43 .cfi_endproc 44V_FUNCTION_END(__kernel_get_syscall_map) 45 46/* 47 * void unsigned long long __kernel_get_tbfreq(void); 48 * 49 * returns the timebase frequency in HZ 50 */ 51V_FUNCTION_BEGIN(__kernel_get_tbfreq) 52 .cfi_startproc 53 mflr r12 54 .cfi_register lr,r12 55 get_datapage r3 56#ifndef __powerpc64__ 57 lwz r4,(CFG_TB_TICKS_PER_SEC + 4)(r3) 58#endif 59 PPC_LL r3,CFG_TB_TICKS_PER_SEC(r3) 60 mtlr r12 61 crclr cr0*4+so 62 blr 63 .cfi_endproc 64V_FUNCTION_END(__kernel_get_tbfreq) 65