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| author | Joel Sherrill <joel.sherrill@OARcorp.com> | 1998-09-24 13:55:18 +0000 |
|---|---|---|
| committer | Joel Sherrill <joel.sherrill@OARcorp.com> | 1998-09-24 13:55:18 +0000 |
| commit | 32f3e34d4d275c4a0ec45e4ee164eeb82cde520f (patch) | |
| tree | b72a8dec025416839f7ca1bf30beb6dcfb1fc685 /c/src/lib/libbsp/i386/i386ex/start | |
| parent | New version from Erik Ivanenko <erik.ivanenko@utoronto.ca>. (diff) | |
| download | rtems-32f3e34d4d275c4a0ec45e4ee164eeb82cde520f.tar.bz2 | |
Patch from Erik Ivanenko <erik.ivanenko@utoronto.ca>:
Please find attached a start.s that includes a cli prior to the hlt
instruction. This ensures that external interrupts cannot restart
the system after returning to the startup code. ( According to the hlt
docs, they will! )
Also find a new timer.c. ( I forgot to update the countdowm value
in the timer when I changed the PSCLK frequency in start.s) . This
improves timer accuracy.
The raw_idt_notify messages are no longer infinite, I tested sp11 and
sp05, both which were bad, and I have seen the message print once in
one test. I think it's ok if it prints out once. In fact, I don't
think you can effectively stop it!
Diffstat (limited to 'c/src/lib/libbsp/i386/i386ex/start')
| -rw-r--r-- | c/src/lib/libbsp/i386/i386ex/start/start.s | 34 |
1 files changed, 4 insertions, 30 deletions
diff --git a/c/src/lib/libbsp/i386/i386ex/start/start.s b/c/src/lib/libbsp/i386/i386ex/start/start.s index e8cbc71b9c..55fcb1ae82 100644 --- a/c/src/lib/libbsp/i386/i386ex/start/start.s +++ b/c/src/lib/libbsp/i386/i386ex/start/start.s @@ -65,7 +65,6 @@ SYM(Interrupt_descriptor_table): /* Now in data section */ END_DATA BEGIN_DATA -/* .section .gdt */ PUBLIC (_Global_descriptor_table) SYM(GDTR): DESC3( GDT_TABLE, 0x1f ); # one less than the size @@ -344,20 +343,6 @@ SYM(SetUCS1): * The GDT must be in RAM since it must be writeable, * So, move the whole data section down. ********************************************************/ - -/* SYM(xfer_gdt): - movw $ _ram_gdt_offset , di - movw $ _ram_gdt_segment , cx - mov cx , es - - movw $ _gdt_size , cx - movw $ _rom_gdt_segment , ax - movw $ _rom_gdt_offset , si - mov ax , ds - - repne - movsb -*/ movw $ _ram_data_offset , di movw $ _ram_data_segment, cx @@ -376,14 +361,10 @@ SYM(SetUCS1): * Table Register ****************************/ -/* movw $ _ram_gdt_segment, ax */ - #ifdef NEXT_GAS data32 addr32 #endif -/* lgdt _ram_gdt_offset # location of GDT */ - lgdt SYM(GDTR) # location of GDT @@ -405,13 +386,11 @@ SYM(SetUCS): * and load CS selector *********************/ -/* ljmpl $ GDT_CODE_PTR , $ SYM(_copy_data) # sets the code selector*/ ljmpl $ GDT_CODE_PTR , $ SYM(_load_segment_registers) # sets the code selector /* - * Copy the data section down to RAM + * Load the segment registers */ -/*SYM(_copy_data): */ SYM(_load_segment_registers): .code32 pLOAD_SEGMENT( GDT_DATA_PTR, fs) @@ -420,12 +399,6 @@ SYM(_load_segment_registers): pLOAD_SEGMENT( GDT_DATA_PTR, ds) pLOAD_SEGMENT( GDT_DATA_PTR, es) -/* movl $ SYM(_data_start) , edi # ram destination - movl $ SYM(_rom_data_start) , esi # rom data source - movl $ SYM(_data_size) , ecx # amount to move - repne # while ecx != 0 - movsb # move a byte -*/ /* * Set up the stack */ @@ -459,8 +432,9 @@ SYM (zero_bss): pushl $0 # argc call SYM(boot_card) addl $12,esp - - hlt + + cli # stops interrupts from being processed after hlt! + hlt # shutdown END |