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support vsyscall_getcpu() vsyscall. refs #385

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This version simply calls getcpu() system call, so that it's not fast.
This commit is contained in:
NAKAMURA Gou
2015-02-10 15:59:23 +09:00
parent d30d8fe71c
commit a4a806bef7
5 changed files with 26 additions and 0 deletions
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14
arch/x86/kernel/vsyscall.c
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@@ -58,3 +58,17 @@ long vsyscall_time(void *tp)
return t; return t;
} }
extern int vsyscall_getcpu(unsigned *cpup, unsigned *nodep, void *tcachep)
__attribute__ ((section (".vsyscall.getcpu")));
int vsyscall_getcpu(unsigned *cpup, unsigned *nodep, void *tcachep)
{
int error;
asm ("syscall" : "=a" (error)
: "a" (__NR_getcpu), "D" (cpup), "S" (nodep), "d" (tcachep)
: "%rcx", "%r11", "memory");
return error;
}

3
kernel/config/attached-mic.lds
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@@ -30,6 +30,9 @@ SECTIONS
. = vsyscall_page + 0x400; . = vsyscall_page + 0x400;
*(.vsyscall.time) *(.vsyscall.time)
. = vsyscall_page + 0x800;
*(.vsyscall.getcpu)
. = ALIGN(4096); . = ALIGN(4096);
} : data = 0xf4 } : data = 0xf4

3
kernel/config/builtin-mic.lds
View File

@@ -30,6 +30,9 @@ SECTIONS
. = vsyscall_page + 0x400; . = vsyscall_page + 0x400;
*(.vsyscall.time) *(.vsyscall.time)
. = vsyscall_page + 0x800;
*(.vsyscall.getcpu)
. = ALIGN(4096); . = ALIGN(4096);
} : data = 0xf4 } : data = 0xf4

3
kernel/config/builtin-x86.lds
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@@ -30,6 +30,9 @@ SECTIONS
. = vsyscall_page + 0x400; . = vsyscall_page + 0x400;
*(.vsyscall.time) *(.vsyscall.time)
. = vsyscall_page + 0x800;
*(.vsyscall.getcpu)
. = ALIGN(4096); . = ALIGN(4096);
} : data = 0xf4 } : data = 0xf4

3
kernel/config/smp-x86.lds
View File

@@ -30,6 +30,9 @@ SECTIONS
. = vsyscall_page + 0x400; . = vsyscall_page + 0x400;
*(.vsyscall.time) *(.vsyscall.time)
. = vsyscall_page + 0x800;
*(.vsyscall.getcpu)
. = ALIGN(4096); . = ALIGN(4096);
} : data = 0xf4 } : data = 0xf4