i2p/haiku-beta6
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

m68k code.

Browse Source 
We will use SRP (supervisor root pointer) register to hold the current thread pointer.
Its use by the pmmu is optional and I don't plan on using it.
There are 32 other bits left.
Wonder if weshouldn't use it for system_time() instead... will see, but there are no other usable regs.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22696 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
François Revol
2007-10-23 23:48:02 +00:00
parent 1bd446cc44
commit d40bcaab8e
1 changed files with 7 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files
headers/private/kernel/arch/m68k/arch_thread.h
+7 -4
View File
@@ -23,16 +23,19 @@ struct iframe *m68k_get_user_iframe(void);
extern inline struct thread * extern inline struct thread *
arch_thread_get_current_thread(void) arch_thread_get_current_thread(void)
{ {
struct thread *t; uint64 v = 0;
asm volatile("mfsprg2 %0" : "=r"(t)); asm volatile("pmove %%srp,(%0)" : : "a"(&v));
return t; return (struct thread *)(v & 0xffffffff);
} }
extern inline void extern inline void
arch_thread_set_current_thread(struct thread *t) arch_thread_set_current_thread(struct thread *t)
{ {
asm volatile("mtsprg2 %0" : : "r"(t)); uint64 v;
asm volatile("pmove %%srp,(%0)\n" \
"move %1,(4,%0)\n" \
"pmove (%0),%%srp" : : "a"(&v), "d"(t));
} }