diff options
Diffstat (limited to 'src/cpu/amd/geode_lx/cache_as_ram.inc')
| -rw-r--r-- | src/cpu/amd/geode_lx/cache_as_ram.inc | 225 |
1 files changed, 0 insertions, 225 deletions
diff --git a/src/cpu/amd/geode_lx/cache_as_ram.inc b/src/cpu/amd/geode_lx/cache_as_ram.inc deleted file mode 100644 index 8250d729b4..0000000000 --- a/src/cpu/amd/geode_lx/cache_as_ram.inc +++ /dev/null @@ -1,225 +0,0 @@ -/* - * This file is part of the coreboot project. - * - * Copyright (C) 2007 Advanced Micro Devices, Inc. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - */ - -#define LX_STACK_BASE CONFIG_DCACHE_RAM_BASE /* this is where the DCache will be mapped and be used as stack, It would be cool if it was the same base as coreboot normal stack */ -#define LX_STACK_END LX_STACK_BASE+(CONFIG_DCACHE_RAM_SIZE-1) - -#define LX_NUM_CACHELINES 0x080 /* there are 128lines per way */ -#define LX_CACHELINE_SIZE 0x020 /* there are 32bytes per line */ -#define LX_CACHEWAY_SIZE (LX_NUM_CACHELINES * LX_CACHELINE_SIZE) -#define CR0_CD 0x40000000 /* bit 30 = Cache Disable */ -#define CR0_NW 0x20000000 /* bit 29 = Not Write Through */ - -#include <cpu/amd/lxdef.h> -#include <cpu/x86/post_code.h> - -/** - * DCacheSetup - * Setup data cache for use as RAM for a stack. - */ -DCacheSetup: - /* Save the BIST result */ - movl %eax, %ebx - - invd - /* set cache properties */ - movl $CPU_RCONF_DEFAULT, %ecx - rdmsr - movl $0x010010000, %eax /*1MB system memory in write back 1|00100|00 */ - wrmsr - - /* in LX DCDIS is set after POR which disables the cache..., clear this bit */ - movl $CPU_DM_CONFIG0,%ecx - rdmsr - andl $(~(DM_CONFIG0_LOWER_DCDIS_SET)), %eax /* TODO: make consistent with i$ init, either whole reg = 0, or just this bit... */ - wrmsr - - /* get cache timing params from BIOS config data locations and apply */ - /* fix delay controls for DM and IM arrays */ - /* fix delay controls for DM and IM arrays */ - movl $CPU_BC_MSS_ARRAY_CTL0, %ecx - xorl %edx, %edx - movl $0x2814D352, %eax - wrmsr - - movl $CPU_BC_MSS_ARRAY_CTL1, %ecx - xorl %edx, %edx - movl $0x1068334D, %eax - wrmsr - - movl $CPU_BC_MSS_ARRAY_CTL2, %ecx - movl $0x00000106, %edx - movl $0x83104104, %eax - wrmsr - - movl $GLCP_FIFOCTL, %ecx - rdmsr - movl $0x00000005, %edx - wrmsr - - /* Enable setting */ - movl $CPU_BC_MSS_ARRAY_CTL_ENA, %ecx - xorl %edx, %edx - movl $0x01, %eax - wrmsr - - /* Get cleaned up. */ - xorl %edi, %edi - xorl %esi, %esi - xorl %ebp, %ebp - - /* DCache Ways0 through Ways7 will be tagged for LX_STACK_BASE + CONFIG_DCACHE_RAM_SIZE for holding stack */ - /* remember, there is NO stack yet... */ - - /* Tell cache we want to fill WAY 0 starting at the top */ - xorl %edx, %edx - xorl %eax, %eax - movl $CPU_DC_INDEX, %ecx - wrmsr - - /* startaddress for tag of Way0: ebp will hold the incrementing address. dont destroy! */ - movl $LX_STACK_BASE, %ebp /* init to start address */ - orl $1, %ebp /* set valid bit and tag for this Way (B[31:12] : Cache tag value for line/way curr. selected by CPU_DC_INDEX */ - - /* start tag Ways 0 with 128 lines with 32bytes each: edi will hold the line counter. dont destroy! */ - movl $LX_NUM_CACHELINES, %edi -DCacheSetupFillWay: - - /* fill with dummy data: zero it so we can tell it from PCI memory space (returns FFs). */ - /* We will now store a line (32 bytes = 4 x 8bytes = 4 quadWords) */ - movw $0x04, %si - xorl %edx, %edx - xorl %eax, %eax - movl $CPU_DC_DATA, %ecx -DCacheSetup_quadWordLoop: - wrmsr - decw %si - jnz DCacheSetup_quadWordLoop - - /* Set the tag for this line, need to do this for every new cache line to validate it! */ - /* accessing CPU_DC_TAG_I makes the LINE field in CPU_DC_INDEX increment and thus cont. in the next cache line... */ - xorl %edx, %edx - movl %ebp, %eax - movl $CPU_DC_TAG, %ecx - wrmsr - - /* switch to next line */ - /* lines are in Bits10:4 */ - /* when index is crossing 0x7F -> 0x80 writing a RSVD bit as 0x80 is not a valid CL anymore! */ - movl $CPU_DC_INDEX, %ecx - rdmsr - addl $0x010, %eax /* TODO: prob. would be more elegant to calc. this from counter var edi... */ - wrmsr - - decl %edi - jnz DCacheSetupFillWay - - /* 1 Way has been filled, forward start address for next Way, terminate if we have reached end of desired address range */ - addl $LX_CACHEWAY_SIZE, %ebp - cmpl $LX_STACK_END, %ebp - jge leave_DCacheSetup - movl $LX_NUM_CACHELINES, %edi - - /* switch to next way */ - movl $CPU_DC_INDEX, %ecx - rdmsr - addl $0x01, %eax - andl $0xFFFFF80F, %eax /* lets be sure: reset line index Bits10:4 */ - wrmsr - - jmp DCacheSetupFillWay - -leave_DCacheSetup: - xorl %edi, %edi - xorl %esi, %esi - xorl %ebp, %ebp - - /* Disable the cache, but ... DO NOT INVALIDATE the tags. */ - /* Memory reads and writes will all hit in the cache. */ - /* Cache updates and memory write-backs will not occur ! */ - movl %cr0, %eax - orl $(CR0_CD + CR0_NW), %eax /* set the CD and NW bits */ - movl %eax, %cr0 - - /* Now point sp to the cached stack. */ - /* The stack will be fully functional at this location. No system memory is required at all ! */ - /* set up the stack pointer */ - movl $LX_STACK_END, %eax - movl %eax, %esp - - /* test the stack*/ - movl $0x0F0F05A5A, %edx - pushl %edx - popl %ecx - cmpl %ecx, %edx - je DCacheSetupGood - - post_code(0xc5) -DCacheSetupBad: - hlt /* issues */ - jmp DCacheSetupBad -DCacheSetupGood: - /* Go do early init and memory setup */ - - /* Restore the BIST result */ - movl %ebx, %eax - movl %esp, %ebp - pushl %eax - - post_code(0x23) - - /* Call romstage.c main function */ - call mainboard_romstage_entry - -.global done_cache_as_ram_main -done_cache_as_ram_main: - - /* We now run over the stack-in-cache, - * copying it back to itself to invalidate the cache */ - - push %edi - mov $(CONFIG_DCACHE_RAM_SIZE >> 2),%ecx - push %esi - mov $(CONFIG_DCACHE_RAM_BASE),%edi - mov %edi,%esi - cld - rep movsl %ds:(%esi),%es:(%edi) - pop %esi - pop %edi - - /* Clear the cache out to RAM */ - wbinvd - /* re-enable the cache */ - movl %cr0, %eax - xorl $(CR0_CD + CR0_NW), %eax /* clear the CD and NW bits */ - movl %eax, %cr0 - -__main: - post_code(POST_PREPARE_RAMSTAGE) - - /* TODO For suspend/resume low memory needs backup store. */ - - cld /* clear direction flag */ - - /* copy coreboot from it's initial load location to - * the location it is compiled to run at. - * Normally this is copying from FLASH ROM to RAM. - */ - call copy_and_run - -.Lhlt: - post_code(POST_DEAD_CODE) - hlt - jmp .Lhlt |