diff options
| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2022-06-29 14:37:47 +0200 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2022-07-04 08:30:42 +0200 |
| commit | 03e4d1e931cdd6582ccc92b3a4dc883b446b5647 (patch) | |
| tree | dea1774058ed7d4c209d594ed6ea50aae3f6656d /cpukit/score/cpu/i386 | |
| parent | libtests/crypt01: Avoid stack overflows (diff) | |
| download | rtems-03e4d1e931cdd6582ccc92b3a4dc883b446b5647.tar.bz2 | |
score: Add _CPU_Use_thread_local_storage()
At some point during system initialization, the idle threads are created.
Afterwards, the boot processor basically executes within the context of an idle
thread with thread dispatching disabled. On some architectures, the
thread-local storage area of the associated thread must be set in dedicated
processor registers. Add the new CPU port function to do this:
void _CPU_Use_thread_local_storage( const Context_Control *context )
Close #4672.
Diffstat (limited to 'cpukit/score/cpu/i386')
| -rw-r--r-- | cpukit/score/cpu/i386/include/rtems/score/cpuimpl.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/cpukit/score/cpu/i386/include/rtems/score/cpuimpl.h b/cpukit/score/cpu/i386/include/rtems/score/cpuimpl.h index 31ec0ac8bb..71f2679dde 100644 --- a/cpukit/score/cpu/i386/include/rtems/score/cpuimpl.h +++ b/cpukit/score/cpu/i386/include/rtems/score/cpuimpl.h @@ -80,6 +80,32 @@ RTEMS_INLINE_ROUTINE void _CPU_Instruction_no_operation( void ) __asm__ volatile ( "nop" ); } +RTEMS_INLINE_ROUTINE void _CPU_Use_thread_local_storage( + const Context_Control *context +) +{ + uint32_t tmp; + uint32_t cpu_index; + +#ifdef RTEMS_SMP + cpu_index = _CPU_SMP_Get_current_processor(); +#else + cpu_index = 0; +#endif + + __asm__ volatile ( + "movl " RTEMS_XSTRING( I386_CONTEXT_CONTROL_GS_0_OFFSET ) "(%2), %0\n" + "movl %0, _Global_descriptor_table+24(,%1,8)\n" + "movl " RTEMS_XSTRING( I386_CONTEXT_CONTROL_GS_1_OFFSET ) "(%2), %0\n" + "movl %0, _Global_descriptor_table+28(,%1,8)\n" + "leal 24(,%1,8), %0\n" + "movl %0, %%gs\n" + : "=&r" ( tmp ) + : "r" ( cpu_index ), "r" ( context ) + : "memory" + ); +} + #ifdef __cplusplus } #endif |