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Small optimization proposed by "Grey": We load USER_DATA_SEG into %ecx

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anyway, so we can as well push the register later.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34949 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold
2010-01-08 16:41:57 +00:00
parent d756fcf644
commit 74a2534a03
1 changed files with 2 additions and 2 deletions
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src/system/kernel/arch/x86/arch_x86.S
+2 -2
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@@ -164,7 +164,7 @@ FUNCTION(x86_end_userspace_thread_exit):
FUNCTION(x86_enter_userspace): FUNCTION(x86_enter_userspace):
movl 4(%esp), %eax // get entry point movl 4(%esp), %eax // get entry point
movl 8(%esp), %ebx // get user stack movl 8(%esp), %ebx // get user stack
movw $USER_DATA_SEG, %cx movl $USER_DATA_SEG, %ecx
movw %cx, %ds movw %cx, %ds
movw %cx, %es movw %cx, %es
//movw $0x33 + cpu_num, %fs -> fs points to the TLS storage (CPU dependent segment) //movw $0x33 + cpu_num, %fs -> fs points to the TLS storage (CPU dependent segment)
@@ -172,7 +172,7 @@ FUNCTION(x86_enter_userspace):
xorl %ebp, %ebp // this is the last stack frame - we don't need one on return xorl %ebp, %ebp // this is the last stack frame - we don't need one on return
// (%ebp marks the beginning of this stack frame) // (%ebp marks the beginning of this stack frame)
pushl $USER_DATA_SEG // user data segment pushl %ecx // user data segment
pushl %ebx // user stack pushl %ebx // user stack
pushl $(1 << 9) | 2 // user flags pushl $(1 << 9) | 2 // user flags
pushl $USER_CODE_SEG // user code segment pushl $USER_CODE_SEG // user code segment