ff5fadaff3
The current BMIPS SMP code assumes that the slave CPU is physical and logical CPU 1, but on some systems such as BCM3368, the slave CPU is physical CPU0. Fix the code to read the physical CPU (thread ID) we are running this code on, and adjust the relocation vector address based on it. This allows bringing up the second CPU on BCM3368 for instance. Signed-off-by: Florian Fainelli <florian@openwrt.org> Cc: linux-mips@linux-mips.org Cc: cernekee@gmail.com Cc: jogo@openwrt.org Cc: blogic@openwrt.org Patchwork: https://patchwork.linux-mips.org/patch/5621/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
256 lines
5.4 KiB
ArmAsm
256 lines
5.4 KiB
ArmAsm
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2011 by Kevin Cernekee (cernekee@gmail.com)
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*
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* Reset/NMI/re-entry vectors for BMIPS processors
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*/
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#include <linux/init.h>
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#include <asm/asm.h>
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#include <asm/asmmacro.h>
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#include <asm/cacheops.h>
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#include <asm/regdef.h>
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#include <asm/mipsregs.h>
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#include <asm/stackframe.h>
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#include <asm/addrspace.h>
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#include <asm/hazards.h>
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#include <asm/bmips.h>
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.macro BARRIER
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.set mips32
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_ssnop
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_ssnop
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_ssnop
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.set mips0
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.endm
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/***********************************************************************
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* Alternate CPU1 startup vector for BMIPS4350
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*
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* On some systems the bootloader has already started CPU1 and configured
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* it to resume execution at 0x8000_0200 (!BEV IV vector) when it is
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* triggered by the SW1 interrupt. If that is the case we try to move
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* it to a more convenient place: BMIPS_WARM_RESTART_VEC @ 0x8000_0380.
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***********************************************************************/
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LEAF(bmips_smp_movevec)
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la k0, 1f
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li k1, CKSEG1
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or k0, k1
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jr k0
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1:
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/* clear IV, pending IPIs */
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mtc0 zero, CP0_CAUSE
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/* re-enable IRQs to wait for SW1 */
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li k0, ST0_IE | ST0_BEV | STATUSF_IP1
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mtc0 k0, CP0_STATUS
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/* set up CPU1 CBR; move BASE to 0xa000_0000 */
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li k0, 0xff400000
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mtc0 k0, $22, 6
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/* set up relocation vector address based on thread ID */
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mfc0 k1, $22, 3
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srl k1, 16
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andi k1, 0x8000
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or k1, CKSEG1 | BMIPS_RELO_VECTOR_CONTROL_0
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or k0, k1
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li k1, 0xa0080000
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sw k1, 0(k0)
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/* wait here for SW1 interrupt from bmips_boot_secondary() */
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wait
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la k0, bmips_reset_nmi_vec
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li k1, CKSEG1
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or k0, k1
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jr k0
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END(bmips_smp_movevec)
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/***********************************************************************
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* Reset/NMI vector
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* For BMIPS processors that can relocate their exception vectors, this
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* entire function gets copied to 0x8000_0000.
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***********************************************************************/
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NESTED(bmips_reset_nmi_vec, PT_SIZE, sp)
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.set push
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.set noat
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.align 4
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#ifdef CONFIG_SMP
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/* if the NMI bit is clear, assume this is a CPU1 reset instead */
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li k1, (1 << 19)
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mfc0 k0, CP0_STATUS
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and k0, k1
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beqz k0, bmips_smp_entry
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#if defined(CONFIG_CPU_BMIPS5000)
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/* if we're not on core 0, this must be the SMP boot signal */
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li k1, (3 << 25)
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mfc0 k0, $22
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and k0, k1
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bnez k0, bmips_smp_entry
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#endif
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#endif /* CONFIG_SMP */
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/* nope, it's just a regular NMI */
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SAVE_ALL
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move a0, sp
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/* clear EXL, ERL, BEV so that TLB refills still work */
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mfc0 k0, CP0_STATUS
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li k1, ST0_ERL | ST0_EXL | ST0_BEV | ST0_IE
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or k0, k1
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xor k0, k1
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mtc0 k0, CP0_STATUS
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BARRIER
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/* jump to the NMI handler function */
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la k0, nmi_handler
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jr k0
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RESTORE_ALL
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.set mips3
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eret
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/***********************************************************************
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* CPU1 reset vector (used for the initial boot only)
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* This is still part of bmips_reset_nmi_vec().
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***********************************************************************/
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#ifdef CONFIG_SMP
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bmips_smp_entry:
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/* set up CP0 STATUS; enable FPU */
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li k0, 0x30000000
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mtc0 k0, CP0_STATUS
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BARRIER
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/* set local CP0 CONFIG to make kseg0 cacheable, write-back */
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mfc0 k0, CP0_CONFIG
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ori k0, 0x07
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xori k0, 0x04
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mtc0 k0, CP0_CONFIG
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#if defined(CONFIG_CPU_BMIPS4350) || defined(CONFIG_CPU_BMIPS4380)
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/* initialize CPU1's local I-cache */
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li k0, 0x80000000
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li k1, 0x80010000
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mtc0 zero, $28
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mtc0 zero, $28, 1
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BARRIER
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1: cache Index_Store_Tag_I, 0(k0)
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addiu k0, 16
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bne k0, k1, 1b
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#elif defined(CONFIG_CPU_BMIPS5000)
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/* set exception vector base */
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la k0, ebase
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lw k0, 0(k0)
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mtc0 k0, $15, 1
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BARRIER
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#endif
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/* jump back to kseg0 in case we need to remap the kseg1 area */
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la k0, 1f
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jr k0
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1:
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la k0, bmips_enable_xks01
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jalr k0
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/* use temporary stack to set up upper memory TLB */
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li sp, BMIPS_WARM_RESTART_VEC
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la k0, plat_wired_tlb_setup
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jalr k0
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/* switch to permanent stack and continue booting */
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.global bmips_secondary_reentry
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bmips_secondary_reentry:
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la k0, bmips_smp_boot_sp
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lw sp, 0(k0)
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la k0, bmips_smp_boot_gp
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lw gp, 0(k0)
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la k0, start_secondary
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jr k0
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#endif /* CONFIG_SMP */
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.align 4
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.global bmips_reset_nmi_vec_end
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bmips_reset_nmi_vec_end:
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END(bmips_reset_nmi_vec)
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.set pop
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.previous
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/***********************************************************************
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* CPU1 warm restart vector (used for second and subsequent boots).
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* Also used for S2 standby recovery (PM).
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* This entire function gets copied to (BMIPS_WARM_RESTART_VEC)
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***********************************************************************/
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LEAF(bmips_smp_int_vec)
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.align 4
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mfc0 k0, CP0_STATUS
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ori k0, 0x01
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xori k0, 0x01
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mtc0 k0, CP0_STATUS
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eret
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.align 4
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.global bmips_smp_int_vec_end
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bmips_smp_int_vec_end:
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END(bmips_smp_int_vec)
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/***********************************************************************
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* XKS01 support
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* Certain CPUs support extending kseg0 to 1024MB.
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***********************************************************************/
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LEAF(bmips_enable_xks01)
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#if defined(CONFIG_XKS01)
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#if defined(CONFIG_CPU_BMIPS4380)
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mfc0 t0, $22, 3
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li t1, 0x1ff0
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li t2, (1 << 12) | (1 << 9)
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or t0, t1
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xor t0, t1
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or t0, t2
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mtc0 t0, $22, 3
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BARRIER
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#elif defined(CONFIG_CPU_BMIPS5000)
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mfc0 t0, $22, 5
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li t1, 0x01ff
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li t2, (1 << 8) | (1 << 5)
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or t0, t1
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xor t0, t1
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or t0, t2
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mtc0 t0, $22, 5
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BARRIER
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#else
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#error Missing XKS01 setup
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#endif
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#endif /* defined(CONFIG_XKS01) */
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jr ra
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END(bmips_enable_xks01)
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.previous
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