Add initial boot support for e500mc and e5500.
* Since r257190 the kernel must actually be loaded at a 64MB boundary, not 16MB. * Don't program HID1 register on e500mc or e5500, they don't have this SPR. * Set proper HID0 defaults for these new architectures. There is still more work to be done for the various SoCs, and the PMAP code still needs to be extended to 36-bit paddr, coming soon. Obtained from: Semihalf Sponsored by: Alex Perez/Inertial Computing
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Justin Hibbits
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971e02adbe
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7f7fcf5596
@ -61,11 +61,11 @@ __start:
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/*
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* Assumptions on the boot loader:
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* - system memory starts from physical address 0
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* - it's mapped by a single TBL1 entry
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* - System memory starts from physical address 0
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* - It's mapped by a single TLB1 entry
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* - TLB1 mapping is 1:1 pa to va
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* - kernel is loaded at 16MB boundary
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* - all PID registers are set to the same value
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* - Kernel is loaded at 64MB boundary
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* - All PID registers are set to the same value
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* - CPU is running in AS=0
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*
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* Registers contents provided by the loader(8):
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@ -73,14 +73,14 @@ __start:
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* r3 : metadata pointer
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*
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* We rearrange the TLB1 layout as follows:
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* - find TLB1 entry we started in
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* - make sure it's protected, ivalidate other entries
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* - create temp entry in the second AS (make sure it's not TLB[1])
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* - switch to temp mapping
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* - map 16MB of RAM in TLB1[1]
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* - use AS=1, set EPN to KERNBASE and RPN to kernel load address
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* - switch to to TLB1[1] mapping
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* - invalidate temp mapping
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* - Find TLB1 entry we started in
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* - Make sure it's protected, invalidate other entries
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* - Create temp entry in the second AS (make sure it's not TLB[1])
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* - Switch to temp mapping
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* - Map 64MB of RAM in TLB1[1]
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* - Use AS=1, set EPN to KERNBASE and RPN to kernel load address
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* - Switch to to TLB1[1] mapping
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* - Invalidate temp mapping
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*
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* locore registers use:
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* r1 : stack pointer
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@ -104,15 +104,44 @@ __start:
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mtmsr %r3
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isync
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lis %r3, HID0_E500_DEFAULT_SET@h
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ori %r3, %r3, HID0_E500_DEFAULT_SET@l
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mtspr SPR_HID0, %r3
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mfpvr %r3
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rlwinm %r3, %r3, 16, 16, 31
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lis %r4, HID0_E500_DEFAULT_SET@h
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ori %r4, %r4, HID0_E500_DEFAULT_SET@l
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/* Check for e500mc and e5500 */
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cmpli 0, 0, %r3, FSL_E500mc
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bne 2f
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lis %r4, HID0_E500MC_DEFAULT_SET@h
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ori %r4, %r4, HID0_E500MC_DEFAULT_SET@l
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b 3f
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2:
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cmpli 0, 0, %r3, FSL_E5500
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bne 3f
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lis %r4, HID0_E5500_DEFAULT_SET@h
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ori %r4, %r4, HID0_E5500_DEFAULT_SET@l
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3:
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mtspr SPR_HID0, %r4
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isync
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/*
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* E500mc and E5500 do not have HID1 register, so skip HID1 setup on
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* this core.
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*/
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cmpli 0, 0, %r3, FSL_E500mc
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beq 1f
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cmpli 0, 0, %r3, FSL_E5500
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beq 1f
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lis %r3, HID1_E500_DEFAULT_SET@h
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ori %r3, %r3, HID1_E500_DEFAULT_SET@l
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mtspr SPR_HID1, %r3
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isync
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1:
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/* Invalidate all entries in TLB0 */
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li %r3, 0
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bl tlb_inval_all
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@ -153,10 +182,10 @@ __start:
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/*
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* Setup final mapping in TLB1[1] and switch to it
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*/
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/* Final kernel mapping, map in 16 MB of RAM */
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/* Final kernel mapping, map in 64 MB of RAM */
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lis %r3, MAS0_TLBSEL1@h /* Select TLB1 */
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li %r4, 0 /* Entry 0 */
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rlwimi %r3, %r4, 16, 12, 15
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rlwimi %r3, %r4, 16, 10, 15
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mtspr SPR_MAS0, %r3
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isync
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@ -176,10 +205,12 @@ __start:
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/* Discover phys load address */
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bl 3f
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3: mflr %r4 /* Use current address */
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rlwinm %r4, %r4, 0, 0, 7 /* 16MB alignment mask */
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rlwinm %r4, %r4, 0, 0, 5 /* 64MB alignment mask */
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ori %r4, %r4, (MAS3_SX | MAS3_SW | MAS3_SR)@l
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mtspr SPR_MAS3, %r4 /* Set RPN and protection */
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isync
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bl zero_mas7
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bl zero_mas8
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tlbwe
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isync
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msync
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@ -281,15 +312,40 @@ bp_tlb1_end:
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1: mflr %r31 /* r31 hold the address of bp_ntlb1s */
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/* Set HIDs */
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lis %r3, HID0_E500_DEFAULT_SET@h
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ori %r3, %r3, HID0_E500_DEFAULT_SET@l
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mtspr SPR_HID0, %r3
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mfpvr %r3
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rlwinm %r3, %r3, 16, 16, 31
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/* HID0 for E500 is default */
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lis %r4, HID0_E500_DEFAULT_SET@h
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ori %r4, %r4, HID0_E500_DEFAULT_SET@l
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cmpli 0, 0, %r3, FSL_E500mc
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bne 2f
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lis %r4, HID0_E500MC_DEFAULT_SET@h
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ori %r4, %r4, HID0_E500MC_DEFAULT_SET@l
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b 3f
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2:
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cmpli 0, 0, %r3, FSL_E5500
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bne 3f
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lis %r4, HID0_E5500_DEFAULT_SET@h
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ori %r4, %r4, HID0_E5500_DEFAULT_SET@l
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3:
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mtspr SPR_HID0, %r4
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isync
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/*
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* E500mc and E5500 do not have HID1 register, so skip HID1 setup on
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* this core.
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*/
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cmpli 0, 0, %r3, FSL_E500mc
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beq 1f
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cmpli 0, 0, %r3, FSL_E5500
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beq 1f
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lis %r3, HID1_E500_DEFAULT_SET@h
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ori %r3, %r3, HID1_E500_DEFAULT_SET@l
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mtspr SPR_HID1, %r3
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isync
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1:
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/* Enable branch prediction */
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li %r3, BUCSR_BPEN
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mtspr SPR_BUCSR, %r3
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@ -429,8 +485,8 @@ bp_tlb1_end:
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* r3 TLBSEL
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*/
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tlb_inval_all:
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rlwinm %r3, %r3, 3, 0x18 /* TLBSEL */
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ori %r3, %r3, 0x4 /* INVALL */
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rlwinm %r3, %r3, 3, (1 << 3) /* TLBSEL */
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ori %r3, %r3, (1 << 2) /* INVALL */
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tlbivax 0, %r3
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isync
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msync
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@ -472,7 +528,7 @@ tlb1_find_current:
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*/
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tlb1_inval_entry:
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lis %r4, MAS0_TLBSEL1@h /* Select TLB1 */
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rlwimi %r4, %r3, 16, 12, 15 /* Select our entry */
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rlwimi %r4, %r3, 16, 10, 15 /* Select our entry */
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mtspr SPR_MAS0, %r4
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isync
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tlbre
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@ -495,14 +551,14 @@ tlb1_temp_mapping_as1:
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/* Read our current translation */
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lis %r3, MAS0_TLBSEL1@h /* Select TLB1 */
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rlwimi %r3, %r29, 16, 12, 15 /* Select our current entry */
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rlwimi %r3, %r29, 16, 10, 15 /* Select our current entry */
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mtspr SPR_MAS0, %r3
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isync
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tlbre
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/* Prepare and write temp entry */
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lis %r3, MAS0_TLBSEL1@h /* Select TLB1 */
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rlwimi %r3, %r28, 16, 12, 15 /* Select temp entry */
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rlwimi %r3, %r28, 16, 10, 15 /* Select temp entry */
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mtspr SPR_MAS0, %r3
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isync
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mfspr %r5, SPR_MAS1
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@ -513,6 +569,10 @@ tlb1_temp_mapping_as1:
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oris %r5, %r5, (MAS1_VALID | MAS1_IPROT)@h
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mtspr SPR_MAS1, %r5
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isync
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mflr %r3
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bl zero_mas7
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bl zero_mas8
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mtlr %r3
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tlbwe
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isync
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msync
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@ -531,7 +591,7 @@ tlb1_inval_all_but_current:
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andi. %r3, %r3, TLBCFG_NENTRY_MASK@l
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li %r4, 0 /* Start from Entry 0 */
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1: lis %r5, MAS0_TLBSEL1@h
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rlwimi %r5, %r4, 16, 12, 15
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rlwimi %r5, %r4, 16, 10, 15
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mtspr SPR_MAS0, %r5
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isync
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tlbre
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@ -549,6 +609,38 @@ tlb1_inval_all_but_current:
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bne 1b
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blr
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/*
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* MAS7 and MAS8 conditional zeroing.
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*/
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.globl zero_mas7
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zero_mas7:
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mfpvr %r20
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rlwinm %r20, %r20, 16, 16, 31
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cmpli 0, 0, %r20, FSL_E500v1
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beq 1f
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li %r20, 0
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mtspr SPR_MAS7, %r20
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isync
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1:
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blr
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.globl zero_mas8
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zero_mas8:
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mfpvr %r20
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rlwinm %r20, %r20, 16, 16, 31
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cmpli 0, 0, %r20, FSL_E500mc
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beq 1f
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cmpli 0, 0, %r20, FSL_E5500
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beq 1f
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blr
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1:
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li %r20, 0
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mtspr SPR_MAS8, %r20
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isync
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blr
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#ifdef SMP
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__boot_page_padding:
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/*
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