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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2005-2008 Cavium Networks, Inc
*/
#ifndef __ASM_MACH_CAVIUM_OCTEON_KERNEL_ENTRY_H
#define __ASM_MACH_CAVIUM_OCTEON_KERNEL_ENTRY_H
#define CP0_CYCLE_COUNTER $9, 6
#define CP0_CVMCTL_REG $9, 7
#define CP0_CVMMEMCTL_REG $11,7
#define CP0_PRID_REG $15, 0
#define CP0_PRID_OCTEON_PASS1 0x000d0000
#define CP0_PRID_OCTEON_CN30XX 0x000d0200
.macro kernel_entry_setup
# Registers set by bootloader:
# (only 32 bits set by bootloader, all addresses are physical
# addresses, and need to have the appropriate memory region set
# by the kernel
# a0 = argc
# a1 = argv (kseg0 compat addr)
# a2 = 1 if init core, zero otherwise
# a3 = address of boot descriptor block
.set push
.set arch=octeon
# Read the cavium mem control register
dmfc0 v0, CP0_CVMMEMCTL_REG
# Clear the lower 6 bits, the CVMSEG size
dins v0, $0, 0, 6
ori v0, CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE
dmtc0 v0, CP0_CVMMEMCTL_REG # Write the cavium mem control register
dmfc0 v0, CP0_CVMCTL_REG # Read the cavium control register
# Disable unaligned load/store support but leave HW fixup enabled
# Needed for octeon specific memcpy
or v0, v0, 0x5001
xor v0, v0, 0x1001
# Read the processor ID register
mfc0 v1, CP0_PRID_REG
# Disable instruction prefetching (Octeon Pass1 errata)
or v0, v0, 0x2000
# Skip reenable of prefetching for Octeon Pass1
beq v1, CP0_PRID_OCTEON_PASS1, skip
nop
# Reenable instruction prefetching, not on Pass1
xor v0, v0, 0x2000
# Strip off pass number off of processor id
srl v1, 8
sll v1, 8
# CN30XX needs some extra stuff turned off for better performance
bne v1, CP0_PRID_OCTEON_CN30XX, skip
nop
# CN30XX Use random Icache replacement
or v0, v0, 0x400
# CN30XX Disable instruction prefetching
or v0, v0, 0x2000
skip:
# First clear off CvmCtl[IPPCI] bit and move the performance
# counters interrupt to IRQ 6
li v1, ~(7 << 7)
and v0, v0, v1
ori v0, v0, (6 << 7)
# Write the cavium control register
dmtc0 v0, CP0_CVMCTL_REG
sync
# Flush dcache after config change
cache 9, 0($0)
# Get my core id
rdhwr v0, $0
# Jump the master to kernel_entry
bne a2, zero, octeon_main_processor
nop
#ifdef CONFIG_SMP
#
# All cores other than the master need to wait here for SMP bootstrap
# to begin
#
# This is the variable where the next core to boot os stored
PTR_LA t0, octeon_processor_boot
octeon_spin_wait_boot:
# Get the core id of the next to be booted
LONG_L t1, (t0)
# Keep looping if it isn't me
bne t1, v0, octeon_spin_wait_boot
nop
# Get my GP from the global variable
PTR_LA t0, octeon_processor_gp
LONG_L gp, (t0)
# Get my SP from the global variable
PTR_LA t0, octeon_processor_sp
LONG_L sp, (t0)
# Set the SP global variable to zero so the master knows we've started
LONG_S zero, (t0)
#ifdef __OCTEON__
syncw
syncw
#else
sync
#endif
# Jump to the normal Linux SMP entry point
j smp_bootstrap
nop
#else /* CONFIG_SMP */
#
# Someone tried to boot SMP with a non SMP kernel. All extra cores
# will halt here.
#
octeon_wait_forever:
wait
b octeon_wait_forever
nop
#endif /* CONFIG_SMP */
octeon_main_processor:
.set pop
.endm
/*
* Do SMP slave processor setup necessary before we can savely execute C code.
*/
.macro smp_slave_setup
.endm
#endif /* __ASM_MACH_CAVIUM_OCTEON_KERNEL_ENTRY_H */
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