Intel cpus: apply some good programming practices in new CAR
Delete dead CAR code and whitespace fixes. Replace cryptic 32bit hex values with existing LAPIC definitions. Do not assume state of direction flag before "rep" instruction. Do not load immediate values on temporary registers when not needed. Parameter pushed on stack was not popped (or flushed) after returning from call. This is a sort-of memory leak if multiple call's are implemented the same way. Change-Id: Ibb93e889b3a0af87b89345c462e331881e78686a Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com> Reviewed-on: http://review.coreboot.org/643 Tested-by: build bot (Jenkins) Reviewed-by: Idwer Vollering <vidwer@gmail.com> Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
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@ -21,6 +21,10 @@
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#include <cpu/x86/stack.h>
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#include <cpu/x86/mtrr.h>
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#include <cpu/x86/post_code.h>
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#include <cpu/x86/lapic_def.h>
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/* Macro to access Local APIC registers at default base. */
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#define LAPIC(x) $(LAPIC_DEFAULT_BASE | LAPIC_ ## x)
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#define CPU_MAXPHYADDR 36
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#define CPU_PHYSMASK_HI (1 << (CPU_MAXPHYADDR - 32) - 1)
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@ -38,9 +42,9 @@ cache_as_ram:
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post_code(0x20)
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/* Send INIT IPI to all excluding ourself. */
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movl $0x000C4500, %eax
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movl $0xFEE00300, %esi
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movl %eax, (%esi)
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movl LAPIC(ICR), %edi
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movl $(LAPIC_DEST_ALLBUT | LAPIC_INT_ASSERT | LAPIC_DM_INIT), %eax
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movl %eax, (%edi)
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/* Zero out all fixed range and variable range MTRRs. */
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movl $mtrr_table, %esi
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@ -86,17 +90,16 @@ clear_mtrrs:
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wrmsr
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/* Enable cache (CR0.CD = 0, CR0.NW = 0). */
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movl %cr0, %eax
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movl %cr0, %eax
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andl $(~((1 << 30) | (1 << 29))), %eax
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invd
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movl %eax, %cr0
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/* Clear the cache memory reagion. */
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movl $CACHE_AS_RAM_BASE, %esi
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movl %esi, %edi
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movl $(CACHE_AS_RAM_SIZE / 4), %ecx
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// movl $0x23322332, %eax
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cld
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xorl %eax, %eax
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movl $CACHE_AS_RAM_BASE, %edi
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movl $(CACHE_AS_RAM_SIZE / 4), %ecx
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rep stosl
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/* Enable Cache-as-RAM mode by disabling cache. */
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@ -131,11 +134,10 @@ clear_mtrrs:
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/* Set up the stack pointer. */
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#if CONFIG_USBDEBUG
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/* Leave some space for the struct ehci_debug_info. */
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movl $(CACHE_AS_RAM_BASE + CACHE_AS_RAM_SIZE - 4 - 128), %eax
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movl $(CACHE_AS_RAM_BASE + CACHE_AS_RAM_SIZE - 4 - 128), %esp
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#else
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movl $(CACHE_AS_RAM_BASE + CACHE_AS_RAM_SIZE - 4), %eax
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movl $(CACHE_AS_RAM_BASE + CACHE_AS_RAM_SIZE - 4), %esp
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#endif
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movl %eax, %esp
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/* Restore the BIST result. */
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movl %ebp, %eax
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@ -146,6 +148,7 @@ clear_mtrrs:
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/* Call romstage.c main function. */
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call main
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addl $4, %esp
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post_code(0x2f)
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@ -167,18 +170,6 @@ clear_mtrrs:
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post_code(0x31)
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invd
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#if 0
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xorl %eax, %eax
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xorl %edx, %edx
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movl $MTRRphysBase_MSR(0), %ecx
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wrmsr
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movl $MTRRphysMask_MSR(0), %ecx
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wrmsr
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movl $MTRRphysBase_MSR(1), %ecx
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wrmsr
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movl $MTRRphysMask_MSR(1), %ecx
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wrmsr
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#endif
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post_code(0x33)
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@ -196,7 +187,7 @@ clear_mtrrs:
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post_code(0x38)
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/* Enable Write Back and Speculative Reads for the first 1MB. */
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/* Enable Write Back and Speculative Reads for low RAM. */
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movl $MTRRphysBase_MSR(0), %ecx
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movl $(0x00000000 | MTRR_TYPE_WRBACK), %eax
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xorl %edx, %edx
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