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| /*
| * Copyright (C) 2013 Imagination Technologies
| * Author: Paul Burton <paul.burton@mips.com>
| *
| * This program is free software; you can redistribute it and/or modify it
| * under the terms of the GNU General Public License as published by the
| * Free Software Foundation; either version 2 of the License, or (at your
| * option) any later version.
| */
|
| #include <asm/addrspace.h>
| #include <asm/asm.h>
| #include <asm/asm-offsets.h>
| #include <asm/asmmacro.h>
| #include <asm/cacheops.h>
| #include <asm/eva.h>
| #include <asm/mipsregs.h>
| #include <asm/mipsmtregs.h>
| #include <asm/pm.h>
|
| #define GCR_CPC_BASE_OFS 0x0088
| #define GCR_CL_COHERENCE_OFS 0x2008
| #define GCR_CL_ID_OFS 0x2028
|
| #define CPC_CL_VC_STOP_OFS 0x2020
| #define CPC_CL_VC_RUN_OFS 0x2028
|
| .extern mips_cm_base
|
| .set noreorder
|
| #ifdef CONFIG_64BIT
| # define STATUS_BITDEPS ST0_KX
| #else
| # define STATUS_BITDEPS 0
| #endif
|
| #ifdef CONFIG_MIPS_CPS_NS16550
|
| #define DUMP_EXCEP(name) \
| PTR_LA a0, 8f; \
| jal mips_cps_bev_dump; \
| nop; \
| TEXT(name)
|
| #else /* !CONFIG_MIPS_CPS_NS16550 */
|
| #define DUMP_EXCEP(name)
|
| #endif /* !CONFIG_MIPS_CPS_NS16550 */
|
| /*
| * Set dest to non-zero if the core supports the MT ASE, else zero. If
| * MT is not supported then branch to nomt.
| */
| .macro has_mt dest, nomt
| mfc0 \dest, CP0_CONFIG, 1
| bgez \dest, \nomt
| mfc0 \dest, CP0_CONFIG, 2
| bgez \dest, \nomt
| mfc0 \dest, CP0_CONFIG, 3
| andi \dest, \dest, MIPS_CONF3_MT
| beqz \dest, \nomt
| nop
| .endm
|
| /*
| * Set dest to non-zero if the core supports MIPSr6 multithreading
| * (ie. VPs), else zero. If MIPSr6 multithreading is not supported then
| * branch to nomt.
| */
| .macro has_vp dest, nomt
| mfc0 \dest, CP0_CONFIG, 1
| bgez \dest, \nomt
| mfc0 \dest, CP0_CONFIG, 2
| bgez \dest, \nomt
| mfc0 \dest, CP0_CONFIG, 3
| bgez \dest, \nomt
| mfc0 \dest, CP0_CONFIG, 4
| bgez \dest, \nomt
| mfc0 \dest, CP0_CONFIG, 5
| andi \dest, \dest, MIPS_CONF5_VP
| beqz \dest, \nomt
| nop
| .endm
|
| /* Calculate an uncached address for the CM GCRs */
| .macro cmgcrb dest
| .set push
| .set noat
| MFC0 $1, CP0_CMGCRBASE
| PTR_SLL $1, $1, 4
| PTR_LI \dest, UNCAC_BASE
| PTR_ADDU \dest, \dest, $1
| .set pop
| .endm
|
| .section .text.cps-vec
| .balign 0x1000
|
| LEAF(mips_cps_core_entry)
| /*
| * These first 4 bytes will be patched by cps_smp_setup to load the
| * CCA to use into register s0.
| */
| .word 0
|
| /* Check whether we're here due to an NMI */
| mfc0 k0, CP0_STATUS
| and k0, k0, ST0_NMI
| beqz k0, not_nmi
| nop
|
| /* This is an NMI */
| PTR_LA k0, nmi_handler
| jr k0
| nop
|
| not_nmi:
| /* Setup Cause */
| li t0, CAUSEF_IV
| mtc0 t0, CP0_CAUSE
|
| /* Setup Status */
| li t0, ST0_CU1 | ST0_CU0 | ST0_BEV | STATUS_BITDEPS
| mtc0 t0, CP0_STATUS
|
| /* Skip cache & coherence setup if we're already coherent */
| cmgcrb v1
| lw s7, GCR_CL_COHERENCE_OFS(v1)
| bnez s7, 1f
| nop
|
| /* Initialize the L1 caches */
| jal mips_cps_cache_init
| nop
|
| /* Enter the coherent domain */
| li t0, 0xff
| sw t0, GCR_CL_COHERENCE_OFS(v1)
| ehb
|
| /* Set Kseg0 CCA to that in s0 */
| 1: mfc0 t0, CP0_CONFIG
| ori t0, 0x7
| xori t0, 0x7
| or t0, t0, s0
| mtc0 t0, CP0_CONFIG
| ehb
|
| /* Jump to kseg0 */
| PTR_LA t0, 1f
| jr t0
| nop
|
| /*
| * We're up, cached & coherent. Perform any EVA initialization necessary
| * before we access memory.
| */
| 1: eva_init
|
| /* Retrieve boot configuration pointers */
| jal mips_cps_get_bootcfg
| nop
|
| /* Skip core-level init if we started up coherent */
| bnez s7, 1f
| nop
|
| /* Perform any further required core-level initialisation */
| jal mips_cps_core_init
| nop
|
| /*
| * Boot any other VPEs within this core that should be online, and
| * deactivate this VPE if it should be offline.
| */
| move a1, t9
| jal mips_cps_boot_vpes
| move a0, v0
|
| /* Off we go! */
| 1: PTR_L t1, VPEBOOTCFG_PC(v1)
| PTR_L gp, VPEBOOTCFG_GP(v1)
| PTR_L sp, VPEBOOTCFG_SP(v1)
| jr t1
| nop
| END(mips_cps_core_entry)
|
| .org 0x200
| LEAF(excep_tlbfill)
| DUMP_EXCEP("TLB Fill")
| b .
| nop
| END(excep_tlbfill)
|
| .org 0x280
| LEAF(excep_xtlbfill)
| DUMP_EXCEP("XTLB Fill")
| b .
| nop
| END(excep_xtlbfill)
|
| .org 0x300
| LEAF(excep_cache)
| DUMP_EXCEP("Cache")
| b .
| nop
| END(excep_cache)
|
| .org 0x380
| LEAF(excep_genex)
| DUMP_EXCEP("General")
| b .
| nop
| END(excep_genex)
|
| .org 0x400
| LEAF(excep_intex)
| DUMP_EXCEP("Interrupt")
| b .
| nop
| END(excep_intex)
|
| .org 0x480
| LEAF(excep_ejtag)
| PTR_LA k0, ejtag_debug_handler
| jr k0
| nop
| END(excep_ejtag)
|
| LEAF(mips_cps_core_init)
| #ifdef CONFIG_MIPS_MT_SMP
| /* Check that the core implements the MT ASE */
| has_mt t0, 3f
|
| .set push
| .set MIPS_ISA_LEVEL_RAW
| .set mt
|
| /* Only allow 1 TC per VPE to execute... */
| dmt
|
| /* ...and for the moment only 1 VPE */
| dvpe
| PTR_LA t1, 1f
| jr.hb t1
| nop
|
| /* Enter VPE configuration state */
| 1: mfc0 t0, CP0_MVPCONTROL
| ori t0, t0, MVPCONTROL_VPC
| mtc0 t0, CP0_MVPCONTROL
|
| /* Retrieve the number of VPEs within the core */
| mfc0 t0, CP0_MVPCONF0
| srl t0, t0, MVPCONF0_PVPE_SHIFT
| andi t0, t0, (MVPCONF0_PVPE >> MVPCONF0_PVPE_SHIFT)
| addiu ta3, t0, 1
|
| /* If there's only 1, we're done */
| beqz t0, 2f
| nop
|
| /* Loop through each VPE within this core */
| li ta1, 1
|
| 1: /* Operate on the appropriate TC */
| mtc0 ta1, CP0_VPECONTROL
| ehb
|
| /* Bind TC to VPE (1:1 TC:VPE mapping) */
| mttc0 ta1, CP0_TCBIND
|
| /* Set exclusive TC, non-active, master */
| li t0, VPECONF0_MVP
| sll t1, ta1, VPECONF0_XTC_SHIFT
| or t0, t0, t1
| mttc0 t0, CP0_VPECONF0
|
| /* Set TC non-active, non-allocatable */
| mttc0 zero, CP0_TCSTATUS
|
| /* Set TC halted */
| li t0, TCHALT_H
| mttc0 t0, CP0_TCHALT
|
| /* Next VPE */
| addiu ta1, ta1, 1
| slt t0, ta1, ta3
| bnez t0, 1b
| nop
|
| /* Leave VPE configuration state */
| 2: mfc0 t0, CP0_MVPCONTROL
| xori t0, t0, MVPCONTROL_VPC
| mtc0 t0, CP0_MVPCONTROL
|
| 3: .set pop
| #endif
| jr ra
| nop
| END(mips_cps_core_init)
|
| /**
| * mips_cps_get_bootcfg() - retrieve boot configuration pointers
| *
| * Returns: pointer to struct core_boot_config in v0, pointer to
| * struct vpe_boot_config in v1, VPE ID in t9
| */
| LEAF(mips_cps_get_bootcfg)
| /* Calculate a pointer to this cores struct core_boot_config */
| cmgcrb t0
| lw t0, GCR_CL_ID_OFS(t0)
| li t1, COREBOOTCFG_SIZE
| mul t0, t0, t1
| PTR_LA t1, mips_cps_core_bootcfg
| PTR_L t1, 0(t1)
| PTR_ADDU v0, t0, t1
|
| /* Calculate this VPEs ID. If the core doesn't support MT use 0 */
| li t9, 0
| #if defined(CONFIG_CPU_MIPSR6)
| has_vp ta2, 1f
|
| /*
| * Assume non-contiguous numbering. Perhaps some day we'll need
| * to handle contiguous VP numbering, but no such systems yet
| * exist.
| */
| mfc0 t9, CP0_GLOBALNUMBER
| andi t9, t9, MIPS_GLOBALNUMBER_VP
| #elif defined(CONFIG_MIPS_MT_SMP)
| has_mt ta2, 1f
|
| /* Find the number of VPEs present in the core */
| mfc0 t1, CP0_MVPCONF0
| srl t1, t1, MVPCONF0_PVPE_SHIFT
| andi t1, t1, MVPCONF0_PVPE >> MVPCONF0_PVPE_SHIFT
| addiu t1, t1, 1
|
| /* Calculate a mask for the VPE ID from EBase.CPUNum */
| clz t1, t1
| li t2, 31
| subu t1, t2, t1
| li t2, 1
| sll t1, t2, t1
| addiu t1, t1, -1
|
| /* Retrieve the VPE ID from EBase.CPUNum */
| mfc0 t9, $15, 1
| and t9, t9, t1
| #endif
|
| 1: /* Calculate a pointer to this VPEs struct vpe_boot_config */
| li t1, VPEBOOTCFG_SIZE
| mul v1, t9, t1
| PTR_L ta3, COREBOOTCFG_VPECONFIG(v0)
| PTR_ADDU v1, v1, ta3
|
| jr ra
| nop
| END(mips_cps_get_bootcfg)
|
| LEAF(mips_cps_boot_vpes)
| lw ta2, COREBOOTCFG_VPEMASK(a0)
| PTR_L ta3, COREBOOTCFG_VPECONFIG(a0)
|
| #if defined(CONFIG_CPU_MIPSR6)
|
| has_vp t0, 5f
|
| /* Find base address of CPC */
| cmgcrb t3
| PTR_L t1, GCR_CPC_BASE_OFS(t3)
| PTR_LI t2, ~0x7fff
| and t1, t1, t2
| PTR_LI t2, UNCAC_BASE
| PTR_ADD t1, t1, t2
|
| /* Start any other VPs that ought to be running */
| PTR_S ta2, CPC_CL_VC_RUN_OFS(t1)
|
| /* Ensure this VP stops running if it shouldn't be */
| not ta2
| PTR_S ta2, CPC_CL_VC_STOP_OFS(t1)
| ehb
|
| #elif defined(CONFIG_MIPS_MT)
|
| /* If the core doesn't support MT then return */
| has_mt t0, 5f
|
| /* Enter VPE configuration state */
| .set push
| .set MIPS_ISA_LEVEL_RAW
| .set mt
| dvpe
| .set pop
|
| PTR_LA t1, 1f
| jr.hb t1
| nop
| 1: mfc0 t1, CP0_MVPCONTROL
| ori t1, t1, MVPCONTROL_VPC
| mtc0 t1, CP0_MVPCONTROL
| ehb
|
| /* Loop through each VPE */
| move t8, ta2
| li ta1, 0
|
| /* Check whether the VPE should be running. If not, skip it */
| 1: andi t0, ta2, 1
| beqz t0, 2f
| nop
|
| /* Operate on the appropriate TC */
| mfc0 t0, CP0_VPECONTROL
| ori t0, t0, VPECONTROL_TARGTC
| xori t0, t0, VPECONTROL_TARGTC
| or t0, t0, ta1
| mtc0 t0, CP0_VPECONTROL
| ehb
|
| .set push
| .set MIPS_ISA_LEVEL_RAW
| .set mt
|
| /* Skip the VPE if its TC is not halted */
| mftc0 t0, CP0_TCHALT
| beqz t0, 2f
| nop
|
| /* Calculate a pointer to the VPEs struct vpe_boot_config */
| li t0, VPEBOOTCFG_SIZE
| mul t0, t0, ta1
| addu t0, t0, ta3
|
| /* Set the TC restart PC */
| lw t1, VPEBOOTCFG_PC(t0)
| mttc0 t1, CP0_TCRESTART
|
| /* Set the TC stack pointer */
| lw t1, VPEBOOTCFG_SP(t0)
| mttgpr t1, sp
|
| /* Set the TC global pointer */
| lw t1, VPEBOOTCFG_GP(t0)
| mttgpr t1, gp
|
| /* Copy config from this VPE */
| mfc0 t0, CP0_CONFIG
| mttc0 t0, CP0_CONFIG
|
| /*
| * Copy the EVA config from this VPE if the CPU supports it.
| * CONFIG3 must exist to be running MT startup - just read it.
| */
| mfc0 t0, CP0_CONFIG, 3
| and t0, t0, MIPS_CONF3_SC
| beqz t0, 3f
| nop
| mfc0 t0, CP0_SEGCTL0
| mttc0 t0, CP0_SEGCTL0
| mfc0 t0, CP0_SEGCTL1
| mttc0 t0, CP0_SEGCTL1
| mfc0 t0, CP0_SEGCTL2
| mttc0 t0, CP0_SEGCTL2
| 3:
| /* Ensure no software interrupts are pending */
| mttc0 zero, CP0_CAUSE
| mttc0 zero, CP0_STATUS
|
| /* Set TC active, not interrupt exempt */
| mftc0 t0, CP0_TCSTATUS
| li t1, ~TCSTATUS_IXMT
| and t0, t0, t1
| ori t0, t0, TCSTATUS_A
| mttc0 t0, CP0_TCSTATUS
|
| /* Clear the TC halt bit */
| mttc0 zero, CP0_TCHALT
|
| /* Set VPE active */
| mftc0 t0, CP0_VPECONF0
| ori t0, t0, VPECONF0_VPA
| mttc0 t0, CP0_VPECONF0
|
| /* Next VPE */
| 2: srl ta2, ta2, 1
| addiu ta1, ta1, 1
| bnez ta2, 1b
| nop
|
| /* Leave VPE configuration state */
| mfc0 t1, CP0_MVPCONTROL
| xori t1, t1, MVPCONTROL_VPC
| mtc0 t1, CP0_MVPCONTROL
| ehb
| evpe
|
| .set pop
|
| /* Check whether this VPE is meant to be running */
| li t0, 1
| sll t0, t0, a1
| and t0, t0, t8
| bnez t0, 2f
| nop
|
| /* This VPE should be offline, halt the TC */
| li t0, TCHALT_H
| mtc0 t0, CP0_TCHALT
| PTR_LA t0, 1f
| 1: jr.hb t0
| nop
|
| 2:
|
| #endif /* CONFIG_MIPS_MT_SMP */
|
| /* Return */
| 5: jr ra
| nop
| END(mips_cps_boot_vpes)
|
| LEAF(mips_cps_cache_init)
| /*
| * Clear the bits used to index the caches. Note that the architecture
| * dictates that writing to any of TagLo or TagHi selects 0 or 2 should
| * be valid for all MIPS32 CPUs, even those for which said writes are
| * unnecessary.
| */
| mtc0 zero, CP0_TAGLO, 0
| mtc0 zero, CP0_TAGHI, 0
| mtc0 zero, CP0_TAGLO, 2
| mtc0 zero, CP0_TAGHI, 2
| ehb
|
| /* Primary cache configuration is indicated by Config1 */
| mfc0 v0, CP0_CONFIG, 1
|
| /* Detect I-cache line size */
| _EXT t0, v0, MIPS_CONF1_IL_SHF, MIPS_CONF1_IL_SZ
| beqz t0, icache_done
| li t1, 2
| sllv t0, t1, t0
|
| /* Detect I-cache size */
| _EXT t1, v0, MIPS_CONF1_IS_SHF, MIPS_CONF1_IS_SZ
| xori t2, t1, 0x7
| beqz t2, 1f
| li t3, 32
| addiu t1, t1, 1
| sllv t1, t3, t1
| 1: /* At this point t1 == I-cache sets per way */
| _EXT t2, v0, MIPS_CONF1_IA_SHF, MIPS_CONF1_IA_SZ
| addiu t2, t2, 1
| mul t1, t1, t0
| mul t1, t1, t2
|
| li a0, CKSEG0
| PTR_ADD a1, a0, t1
| 1: cache Index_Store_Tag_I, 0(a0)
| PTR_ADD a0, a0, t0
| bne a0, a1, 1b
| nop
| icache_done:
|
| /* Detect D-cache line size */
| _EXT t0, v0, MIPS_CONF1_DL_SHF, MIPS_CONF1_DL_SZ
| beqz t0, dcache_done
| li t1, 2
| sllv t0, t1, t0
|
| /* Detect D-cache size */
| _EXT t1, v0, MIPS_CONF1_DS_SHF, MIPS_CONF1_DS_SZ
| xori t2, t1, 0x7
| beqz t2, 1f
| li t3, 32
| addiu t1, t1, 1
| sllv t1, t3, t1
| 1: /* At this point t1 == D-cache sets per way */
| _EXT t2, v0, MIPS_CONF1_DA_SHF, MIPS_CONF1_DA_SZ
| addiu t2, t2, 1
| mul t1, t1, t0
| mul t1, t1, t2
|
| li a0, CKSEG0
| PTR_ADDU a1, a0, t1
| PTR_SUBU a1, a1, t0
| 1: cache Index_Store_Tag_D, 0(a0)
| bne a0, a1, 1b
| PTR_ADD a0, a0, t0
| dcache_done:
|
| jr ra
| nop
| END(mips_cps_cache_init)
|
| #if defined(CONFIG_MIPS_CPS_PM) && defined(CONFIG_CPU_PM)
|
| /* Calculate a pointer to this CPUs struct mips_static_suspend_state */
| .macro psstate dest
| .set push
| .set noat
| lw $1, TI_CPU(gp)
| sll $1, $1, LONGLOG
| PTR_LA \dest, __per_cpu_offset
| addu $1, $1, \dest
| lw $1, 0($1)
| PTR_LA \dest, cps_cpu_state
| addu \dest, \dest, $1
| .set pop
| .endm
|
| LEAF(mips_cps_pm_save)
| /* Save CPU state */
| SUSPEND_SAVE_REGS
| psstate t1
| SUSPEND_SAVE_STATIC
| jr v0
| nop
| END(mips_cps_pm_save)
|
| LEAF(mips_cps_pm_restore)
| /* Restore CPU state */
| psstate t1
| RESUME_RESTORE_STATIC
| RESUME_RESTORE_REGS_RETURN
| END(mips_cps_pm_restore)
|
| #endif /* CONFIG_MIPS_CPS_PM && CONFIG_CPU_PM */
|
|