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- /*
- * Access to the shared data page by the vDSO & syscall map
- *
- * Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org), IBM Corp.
- *
- * 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/processor.h>
- #include <asm/ppc_asm.h>
- #include <asm/asm-offsets.h>
- #include <asm/unistd.h>
- #include <asm/vdso.h>
- .text
- .global __kernel_datapage_offset;
- __kernel_datapage_offset:
- .long 0
- V_FUNCTION_BEGIN(__get_datapage)
- .cfi_startproc
- /* We don't want that exposed or overridable as we want other objects
- * to be able to bl directly to here
- */
- .protected __get_datapage
- .hidden __get_datapage
- mflr r0
- .cfi_register lr,r0
- bcl 20,31,data_page_branch
- data_page_branch:
- mflr r3
- mtlr r0
- addi r3, r3, __kernel_datapage_offset-data_page_branch
- lwz r0,0(r3)
- add r3,r0,r3
- blr
- .cfi_endproc
- V_FUNCTION_END(__get_datapage)
- /*
- * void *__kernel_get_syscall_map(unsigned int *syscall_count) ;
- *
- * returns a pointer to the syscall map. the map is agnostic to the
- * size of "long", unlike kernel bitops, it stores bits from top to
- * bottom so that memory actually contains a linear bitmap
- * check for syscall N by testing bit (0x80000000 >> (N & 0x1f)) of
- * 32 bits int at N >> 5.
- */
- V_FUNCTION_BEGIN(__kernel_get_syscall_map)
- .cfi_startproc
- mflr r12
- .cfi_register lr,r12
- mr r4,r3
- bl __get_datapage@local
- mtlr r12
- addi r3,r3,CFG_SYSCALL_MAP32
- cmpli cr0,r4,0
- beqlr
- li r0,NR_syscalls
- stw r0,0(r4)
- crclr cr0*4+so
- blr
- .cfi_endproc
- V_FUNCTION_END(__kernel_get_syscall_map)
- /*
- * void unsigned long long __kernel_get_tbfreq(void);
- *
- * returns the timebase frequency in HZ
- */
- V_FUNCTION_BEGIN(__kernel_get_tbfreq)
- .cfi_startproc
- mflr r12
- .cfi_register lr,r12
- bl __get_datapage@local
- lwz r4,(CFG_TB_TICKS_PER_SEC + 4)(r3)
- lwz r3,CFG_TB_TICKS_PER_SEC(r3)
- mtlr r12
- crclr cr0*4+so
- blr
- .cfi_endproc
- V_FUNCTION_END(__kernel_get_tbfreq)
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