2 * This file is part of the coreboot project.
4 * Copyright (C) 2007 Advanced Micro Devices, Inc.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 #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 */
21 #define LX_STACK_END LX_STACK_BASE+(CONFIG_DCACHE_RAM_SIZE-1)
23 #define LX_NUM_CACHELINES 0x080 /* there are 128lines per way */
24 #define LX_CACHELINE_SIZE 0x020 /* there are 32bytes per line */
25 #define LX_CACHEWAY_SIZE (LX_NUM_CACHELINES * LX_CACHELINE_SIZE)
26 #define CR0_CD 0x40000000 /* bit 30 = Cache Disable */
27 #define CR0_NW 0x20000000 /* bit 29 = Not Write Through */
28 #include <cpu/amd/lxdef.h>
29 /***************************************************************************
33 /** Setup data cache for use as RAM for a stack.
35 /***************************************************************************/
37 /* Save the BIST result */
41 /* set cache properties */
42 movl $CPU_RCONF_DEFAULT, %ecx
44 movl $0x010010000, %eax /*1MB system memory in write back 1|00100|00 */
47 /* in LX DCDIS is set after POR which disables the cache..., clear this bit */
48 movl CPU_DM_CONFIG0,%ecx
50 andl $(~(DM_CONFIG0_LOWER_DCDIS_SET)), %eax /* TODO: make consistent with i$ init, either whole reg = 0, or just this bit... */
53 /* get cache timing params from BIOS config data locations and apply */
54 /* fix delay controls for DM and IM arrays */
55 /* fix delay controls for DM and IM arrays */
56 movl $CPU_BC_MSS_ARRAY_CTL0, %ecx
58 movl $0x2814D352, %eax
61 movl $CPU_BC_MSS_ARRAY_CTL1, %ecx
63 movl $0x1068334D, %eax
66 movl $CPU_BC_MSS_ARRAY_CTL2, %ecx
67 movl $0x00000106, %edx
68 movl $0x83104104, %eax
71 movl $GLCP_FIFOCTL, %ecx
73 movl $0x00000005, %edx
77 movl $CPU_BC_MSS_ARRAY_CTL_ENA, %ecx
87 /* DCache Ways0 through Ways7 will be tagged for LX_STACK_BASE + CONFIG_DCACHE_RAM_SIZE for holding stack */
88 /* remember, there is NO stack yet... */
90 /* Tell cache we want to fill WAY 0 starting at the top */
93 movl $CPU_DC_INDEX, %ecx
96 /* startaddress for tag of Way0: ebp will hold the incrementing address. dont destroy! */
97 movl $LX_STACK_BASE, %ebp /* init to start address */
98 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 */
100 /* start tag Ways 0 with 128 lines with 32bytes each: edi will hold the line counter. dont destroy! */
101 movl $LX_NUM_CACHELINES, %edi
104 /* fill with dummy data: zero it so we can tell it from PCI memory space (returns FFs). */
105 /* We will now store a line (32 bytes = 4 x 8bytes = 4 quadWords) */
109 movl $CPU_DC_DATA, %ecx
110 DCacheSetup_quadWordLoop:
113 jnz DCacheSetup_quadWordLoop
115 /* Set the tag for this line, need to do this for every new cache line to validate it! */
116 /* accessing CPU_DC_TAG_I makes the LINE field in CPU_DC_INDEX increment and thus cont. in the next cache line... */
119 movl $CPU_DC_TAG, %ecx
122 /* switch to next line */
123 /* lines are in Bits10:4 */
124 /* when index is crossing 0x7F -> 0x80 writing a RSVD bit as 0x80 is not a valid CL anymore! */
125 movl $CPU_DC_INDEX, %ecx
127 addl $0x010, %eax /* TODO: prob. would be more elegant to calc. this from counter var edi... */
131 jnz DCacheSetupFillWay
133 /* 1 Way has been filled, forward start address for next Way, terminate if we have reached end of desired address range */
134 addl $LX_CACHEWAY_SIZE, %ebp
135 cmpl $LX_STACK_END, %ebp
136 jge leave_DCacheSetup
137 movl $LX_NUM_CACHELINES, %edi
139 /* switch to next way */
140 movl $CPU_DC_INDEX, %ecx
143 andl $0xFFFFF80F, %eax /* lets be sure: reset line index Bits10:4 */
146 jmp DCacheSetupFillWay
153 /* Disable the cache, but ... DO NOT INVALIDATE the tags. */
154 /* Memory reads and writes will all hit in the cache. */
155 /* Cache updates and memory write-backs will not occur ! */
157 orl $(CR0_CD + CR0_NW), %eax /* set the CD and NW bits */
160 /* Now point sp to the cached stack. */
161 /* The stack will be fully functional at this location. No system memory is required at all ! */
162 /* set up the stack pointer */
163 movl $LX_STACK_END, %eax
167 movl $0x0F0F05A5A, %edx
178 /* Go do early init and memory setup */
180 /* Restore the BIST result */
187 /* Call romstage.c main function */
189 done_cache_as_ram_main:
191 /* We now run over the stack-in-cache, copying it back to itself to invalidate the cache */
194 mov $(CONFIG_DCACHE_RAM_SIZE/4),%ecx
196 mov $(CONFIG_DCACHE_RAM_BASE),%edi
199 rep movsl %ds:(%esi),%es:(%edi)
203 /* Clear the cache out to ram */
205 /* re-enable the cache */
207 xorl $(CR0_CD + CR0_NW), %eax /* clear the CD and NW bits */
210 /* clear boot_complete flag */
215 /* TODO For suspend/resume the cache will have to live between
216 * CONFIG_RAMBASE and CONFIG_RAMTOP
219 cld /* clear direction flag */
221 /* copy coreboot from it's initial load location to
222 * the location it is compiled to run at.
223 * Normally this is copying from FLASH ROM to RAM.