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grub/grub-core/boot/mips/yeeloong/fwstart.S

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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2000,2001,2002,2003,2004,2005,2007,2008,2009,2010 Free Software Foundation, Inc.
*
* GRUB 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 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/mips/yeeloong/serial.h>
#include <grub/mips/yeeloong/pci.h>
#include <grub/mips/loongson.h>
#include <grub/pci.h>
#include <grub/serial.h>
#include <grub/cs5536.h>
#include <grub/smbus.h>
.set noreorder
.set noat
.set nomacro
.global start,_start,__start
start:
_start:
__start:
bal serial_hw_init
nop
/* Find CS5536 controller. */
/* $t4 chooses device in priority encoding. */
/* Resulting value is kept in GRUB_MACHINE_PCI_CONF_CTRL_REG.
This way we don't need to sacrifice a register for it. */
/* We have only one bus (0). Function is 0. */
lui $t0, %hi(GRUB_MACHINE_PCI_CONF_CTRL_REG_ADDR)
lui $t1, %hi(GRUB_MACHINE_PCI_CONFSPACE)
lui $t3, %hi(GRUB_CS5536_PCIID)
addiu $t3, $t3, %lo(GRUB_CS5536_PCIID)
ori $t4, $zero, 1
lui $a0, %hi(no_cs5536)
1:
andi $t4, $t4, ((1 << GRUB_PCI_NUM_DEVICES) - 1)
beql $t4, $zero, fatal
addiu $a0, $a0, %lo(no_cs5536)
sw $t4, %lo(GRUB_MACHINE_PCI_CONF_CTRL_REG_ADDR) ($t0)
lw $t2, (%lo(GRUB_MACHINE_PCI_CONFSPACE) + GRUB_PCI_REG_PCI_ID) ($t1)
bnel $t2, $t3, 1b
sll $t4, $t4, 1
bal message
addiu $a0, $a0, %lo(cs5536_found)
bal printhex
move $a0, $t4
/* Initialise SMBus controller. */
/* Set GPIO LBAR. */
lui $a0, %hi(GRUB_CS5536_MSR_GPIO_BAR)
addiu $a0, $a0, %lo(GRUB_CS5536_MSR_GPIO_BAR)
ori $a1, $zero, GRUB_CS5536_LBAR_GPIO
/* Set mask to 0xf and enabled bit to 1. */
bal wrmsr
ori $a2, $zero, ((GRUB_CS5536_LBAR_MASK_MASK \
| GRUB_CS5536_LBAR_ENABLE) >> 32)
/* Set SMBUS LBAR. */
lui $a0, %hi(GRUB_CS5536_MSR_SMB_BAR)
addiu $a0, $a0, %lo(GRUB_CS5536_MSR_SMB_BAR)
ori $a1, $zero, GRUB_CS5536_LBAR_SMBUS
/* Set mask to 0xf and enabled bit to 1. */
bal wrmsr
ori $a2, $zero, ((GRUB_CS5536_LBAR_MASK_MASK \
| GRUB_CS5536_LBAR_ENABLE) >> 32)
lui $a0, %hi(smbus_enabled)
bal message
addiu $a0, $a0, %lo(smbus_enabled)
/* Enable SMBus controller pins. */
lui $t0, %hi(GRUB_MACHINE_PCI_IO_BASE + GRUB_CS5536_LBAR_GPIO)
ori $t1, $zero, GRUB_GPIO_SMBUS_PINS
sw $t1, %lo(GRUB_MACHINE_PCI_IO_BASE + GRUB_CS5536_LBAR_GPIO + GRUB_GPIO_REG_OUT_EN) ($t0)
sw $t1, %lo(GRUB_MACHINE_PCI_IO_BASE + GRUB_CS5536_LBAR_GPIO + GRUB_GPIO_REG_OUT_AUX1) ($t0)
sw $t1, %lo(GRUB_MACHINE_PCI_IO_BASE + GRUB_CS5536_LBAR_GPIO + GRUB_GPIO_REG_IN_EN) ($t0)
sw $t1, %lo(GRUB_MACHINE_PCI_IO_BASE + GRUB_CS5536_LBAR_GPIO + GRUB_GPIO_REG_IN_AUX1) ($t0)
lui $t0, %hi(GRUB_MACHINE_PCI_IO_BASE + GRUB_CS5536_LBAR_SMBUS)
/* Disable SMB. */
sb $zero, %lo(GRUB_MACHINE_PCI_IO_BASE + GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL2) ($t0)
/* Disable interrupts. */
sb $zero, %lo(GRUB_MACHINE_PCI_IO_BASE + GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL1) ($t0)
/* Set as master. */
sb $zero, %lo(GRUB_MACHINE_PCI_IO_BASE + GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_ADDR) ($t0)
/* Launch SMBus controller at slowest speed possible. */
ori $t1, $zero, 0xff
sb $t1, %lo(GRUB_MACHINE_PCI_IO_BASE + GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL3) ($t0)
sb $t1, %lo(GRUB_MACHINE_PCI_IO_BASE + GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL2) ($t0)
/* Yeeloong has only one memory slot. */
/* Output first byte on serial for debugging. */
ori $a1, $zero, GRUB_SMB_RAM_START_ADDR
bal read_spd
move $a0, $zero
bal printhex
move $a0, $v0
bal read_spd
ori $a0, $zero, GRUB_SMBUS_SPD_MEMORY_TYPE_ADDR
ori $t0, $zero, GRUB_SMBUS_SPD_MEMORY_TYPE_DDR2
lui $a0, %hi(unimplemented_memory_type)
bne $t0, $v0, fatal
addiu $a0, $a0, %hi(unimplemented_memory_type)
/* And here is our goal: DDR2 controller initialisation. */
lui $t0, %hi(GRUB_CPU_LOONGSON_CORECFG)
ld $t1, %lo(GRUB_CPU_LOONGSON_CORECFG) ($t0)
/* Use addiu for sign-extension. */
addiu $t2, $zero, ~(GRUB_CPU_LOONGSON_CORECFG_DISABLE_DDR2_SPACE|GRUB_CPU_LOONGSON_CORECFG_BUFFER_CPU)
and $t1, $t1, $t2
sd $t1, %lo (GRUB_CPU_LOONGSON_CORECFG) ($t0)
b continue
. = start + GRUB_CPU_LOONGSON_FLASH_TLB_REFILL - GRUB_CPU_LOONGSON_FLASH_START
tlb_refill:
mfc0 $s1, GRUB_CPU_LOONGSON_COP0_EPC
mfc0 $s2, GRUB_CPU_LOONGSON_COP0_BADVADDR
move $s3, $ra
lui $a0, %hi(epc)
bal message
addiu $a0, $a0, %lo(epc)
bal printhex
move $a0, $s1
lui $a0, %hi(badvaddr)
bal message
addiu $a0, $a0, %lo(badvaddr)
bal printhex
move $a0, $s2
lui $a0, %hi(return_msg)
bal message
addiu $a0, $a0, %lo(return_msg)
bal printhex
move $a0, $s3
lui $a0, %hi(newline)
bal message
addiu $a0, $a0, %lo(newline)
lui $a0, %hi(unhandled_tlb_refill)
b fatal
addiu $a0, $a0, %lo(unhandled_tlb_refill)
. = start + GRUB_CPU_LOONGSON_FLASH_CACHE_ERROR - GRUB_CPU_LOONGSON_FLASH_START
cache_error:
lui $a0, %hi(unhandled_cache_error)
b fatal
addiu $a0, $a0, %lo(unhandled_cache_error)
. = start + GRUB_CPU_LOONGSON_FLASH_OTHER_EXCEPTION - GRUB_CPU_LOONGSON_FLASH_START
other_exception:
mfc0 $s0, GRUB_CPU_LOONGSON_COP0_CAUSE
mfc0 $s1, GRUB_CPU_LOONGSON_COP0_EPC
mfc0 $s2, GRUB_CPU_LOONGSON_COP0_BADVADDR
lui $a0, %hi(cause)
bal message
addiu $a0, $a0, %lo(cause)
bal printhex
move $a0, $s0
lui $a0, %hi(epc)
bal message
addiu $a0, $a0, %lo(epc)
bal printhex
move $a0, $s1
lui $a0, %hi(badvaddr)
bal message
addiu $a0, $a0, %lo(badvaddr)
bal printhex
move $a0, $s2
lui $a0, %hi(newline)
bal message
addiu $a0, $a0, %lo(newline)
lui $a0, %hi(unhandled_exception)
b fatal
addiu $a0, $a0, %lo(unhandled_exception)
/* Same as similarly named C function but in asm since
we need it early. */
/* In: none. Out: none. Clobbered: $t0, $t1, $a0. */
serial_hw_init:
lui $t0, %hi (GRUB_MACHINE_SERIAL_PORT)
/* Turn off the interrupt. */
sb $zero, (%lo (GRUB_MACHINE_SERIAL_PORT) + UART_IER)($t0)
/* Set DLAB. */
ori $t1, $zero, UART_DLAB
sb $t1, (%lo (GRUB_MACHINE_SERIAL_PORT) + UART_LCR)($t0)
/* Set the baud rate 115200. */
ori $t1, $zero, GRUB_MACHINE_SERIAL_DIVISOR_115200
sb $t1, (%lo (GRUB_MACHINE_SERIAL_PORT) + UART_DLL)($t0)
sb $zero, (%lo (GRUB_MACHINE_SERIAL_PORT) + UART_DLH)($t0)
/* Set the line status. */
ori $t1, $zero, (UART_NO_PARITY | UART_8BITS_WORD | UART_1_STOP_BIT)
sb $t1, (%lo (GRUB_MACHINE_SERIAL_PORT) + UART_LCR)($t0)
/* Enable the FIFO. */
ori $t1, $zero, UART_ENABLE_FIFO_TRIGGER1
sb $t1, (%lo (GRUB_MACHINE_SERIAL_PORT) + UART_FCR)($t0)
/* Turn on DTR and RTS. */
ori $t1, $zero, UART_ENABLE_DTRRTS
sb $t1, (%lo (GRUB_MACHINE_SERIAL_PORT) + UART_MCR)($t0)
/* Let message return to original caller. */
lui $a0, %hi(notification_string)
addiu $a0, $a0, %lo(notification_string)
/* Print message on serial console. */
/* In: $a0 = asciiz message. Out: none. Clobbered: $t0, $t1, $a0. */
message:
lui $t0, %hi (GRUB_MACHINE_SERIAL_PORT)
1:
lb $t1, (%lo (GRUB_MACHINE_SERIAL_PORT) + UART_LSR)($t0)
andi $t1, $t1, UART_EMPTY_TRANSMITTER
beq $t1, $zero, 1b
nop
lb $t1, 0($a0)
sb $t1, (%lo (GRUB_MACHINE_SERIAL_PORT) + UART_TX)($t0)
bne $t1, $zero, 1b
addiu $a0, $a0, 1
jr $ra
nop
/* Print 32-bit hexadecimal on serial.
In: $a0. Out: None. Clobbered: $a0, $t0, $t1, $t2
*/
printhex:
lui $t0, %hi (GRUB_MACHINE_SERIAL_PORT)
ori $t2, $zero, 8
1:
lb $t1, (%lo (GRUB_MACHINE_SERIAL_PORT) + UART_LSR)($t0)
andi $t1, $t1, UART_EMPTY_TRANSMITTER
beq $t1, $zero, 1b
nop
srl $t1, $a0, 28
addiu $t1, $t1, -10
blt $t1, $zero, 2f
sll $a0, $a0, 4
addiu $t1, $t1, 'A'-10-'0'
2: addiu $t1, $t1, '0'+10
sb $t1, (%lo (GRUB_MACHINE_SERIAL_PORT) + UART_TX)($t0)
addiu $t2, $t2, -1
bne $t2, $zero, 1b
nop
jr $ra
nop
fatal:
bal message
nop
self:
b self
nop
/* Write CS5536 MSR.
In: $a0 address, $a1 lower word, $a2 upper word.
Out: None
Clobbered: $t0
*/
wrmsr:
lui $t0, %hi(GRUB_MACHINE_PCI_CONFSPACE)
sw $a0, (%lo(GRUB_MACHINE_PCI_CONFSPACE) + GRUB_CS5536_MSR_MAILBOX_ADDR) ($t0)
sw $a1, (%lo(GRUB_MACHINE_PCI_CONFSPACE) + GRUB_CS5536_MSR_MAILBOX_DATA0) ($t0)
jr $ra
sw $a2, (%lo(GRUB_MACHINE_PCI_CONFSPACE) + GRUB_CS5536_MSR_MAILBOX_DATA1) ($t0)
/* Wait for SMBus data or empty transmitter. */
/* In: $a0 = exception handler. Out: none. Clobbered: $t0, $t1 */
smbus_wait:
1:
lui $t0, %hi(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_STATUS + GRUB_MACHINE_PCI_IO_BASE)
lb $t0, %lo(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_STATUS + GRUB_MACHINE_PCI_IO_BASE) ($t0)
andi $t1, $t0, GRUB_CS5536_SMB_REG_STATUS_SDAST
bne $t1, $zero, return
nop
andi $t1, $t0, (GRUB_CS5536_SMB_REG_STATUS_BER | GRUB_CS5536_SMB_REG_STATUS_NACK)
beq $t1, $zero, 1b
nop
jr $a0
nop
return:
jr $ra
nop
/* Read SPD byte. In: $a0 byte, $a1 device. Out: $v0 read byte (0x100 on failure).
Clobbered: $t0, $t1, $t2, $t3, $a0. */
read_spd:
move $t2, $a0
move $t3, $ra
lui $a0, %hi(read_spd_fail)
addiu $a0, $a0, %hi(read_spd_fail)
/* Send START. */
lui $t0, %hi(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL1 + GRUB_MACHINE_PCI_IO_BASE)
lb $t1, %lo(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL1 + GRUB_MACHINE_PCI_IO_BASE) ($t0)
ori $t1, $t1, GRUB_CS5536_SMB_REG_CTRL1_START
bal smbus_wait
sb $t1, %lo(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL1 + GRUB_MACHINE_PCI_IO_BASE) ($t0)
/* Send device address. */
lui $t0, %hi(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_DATA + GRUB_MACHINE_PCI_IO_BASE)
sll $t1, $a1, 1
bal smbus_wait
sb $t1, %lo(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_DATA + GRUB_MACHINE_PCI_IO_BASE) ($t0)
/* Send ACK. */
lui $t0, %hi(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL1 + GRUB_MACHINE_PCI_IO_BASE)
lb $t1, %lo(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL1 + GRUB_MACHINE_PCI_IO_BASE) ($t0)
ori $t1, $t1, GRUB_CS5536_SMB_REG_CTRL1_ACK
sb $t1, %lo(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL1 + GRUB_MACHINE_PCI_IO_BASE) ($t0)
/* Send byte address. */
lui $t0, %hi(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_DATA + GRUB_MACHINE_PCI_IO_BASE)
bal smbus_wait
sb $t2, %lo(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_DATA + GRUB_MACHINE_PCI_IO_BASE) ($t0)
/* Send START. */
lui $t0, %hi(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL1 + GRUB_MACHINE_PCI_IO_BASE)
lb $t1, %lo(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL1 + GRUB_MACHINE_PCI_IO_BASE) ($t0)
ori $t1, $t1, GRUB_CS5536_SMB_REG_CTRL1_START
bal smbus_wait
sb $t1, %lo(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL1 + GRUB_MACHINE_PCI_IO_BASE) ($t0)
/* Send device address. */
lui $t0, %hi(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_DATA + GRUB_MACHINE_PCI_IO_BASE)
sll $t1, $a1, 1
ori $t1, $t1, 1
bal smbus_wait
sb $t1, %lo(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_DATA + GRUB_MACHINE_PCI_IO_BASE) ($t0)
/* Send STOP. */
lui $t0, %hi(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL1 + GRUB_MACHINE_PCI_IO_BASE)
lb $t1, %lo(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL1 + GRUB_MACHINE_PCI_IO_BASE) ($t0)
ori $t1, $t1, GRUB_CS5536_SMB_REG_CTRL1_STOP
bal smbus_wait
sb $t1, %lo(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_CTRL1 + GRUB_MACHINE_PCI_IO_BASE) ($t0)
lui $t0, %hi(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_DATA + GRUB_MACHINE_PCI_IO_BASE)
lb $v0, %lo(GRUB_CS5536_LBAR_SMBUS + GRUB_CS5536_SMB_REG_DATA + GRUB_MACHINE_PCI_IO_BASE) ($t0)
jr $t3
andi $v0, $v0, 0xff
read_spd_fail:
jr $t3
ori $v0, $v0, 0x100
notification_string: .asciz "GRUB "
no_cs5536: .asciz "No CS5536 found.\n\r"
cs5536_found: .asciz "CS5536 at "
sm_failed: .asciz "SM transaction failed.\n\r"
unhandled_tlb_refill: .asciz "Unhandled TLB refill.\n\r"
unhandled_cache_error: .asciz "Unhandled cache error.\n\r"
unhandled_exception: .asciz "Unhandled exception.\n\r"
smbus_enabled: .asciz "SMBus controller enabled.\n\r"
unimplemented_memory_type: .asciz "non-DDR2 memory isn't supported.\n\r"
no_cas_latency: .asciz "Couldn't determine CAS latency.\n\r"
cause: .asciz "Cause: "
epc: .asciz "\n\rEPC: "
badvaddr: .asciz "\n\rBadVaddr: "
newline: .asciz "\n\r"
return_msg: .asciz "\n\rReturn address: "
caches_enabled: .asciz "Caches enabled\n\r"
.p2align 3
regdump:
.quad 0x0100010000000101 /* 0 */
.quad 0x0100010100000000 /* 2 */
.quad 0x0101000001000000 /* 3 */
.quad 0x0100020200010101 /* 4 */
.quad 0x0a04030603050203 /* 6 */
.quad 0x0f0e040000010a0b /* 7 */
.quad 0x0000010200000102 /* 8 */
.quad 0x0000060c00000000 /* 9 */
.quad 0x2323233f3f1f0200 /* a */
.quad 0x5f7f232323232323 /* b */
.quad 0x002a3c0615000000 /* c */
.quad 0x002a002a002a002a /* d */
.quad 0x002a002a002a002a /* e */
.quad 0x00b40020006d0004 /* f */
.quad 0x070007ff00000087 /* 10 */
.quad 0x000000000016101f /* 11 */
.quad 0x001c000000000000 /* 12 */
.quad 0x28e1000200c8006b /* 13 */
.quad 0x0000204200c8002f /* 14 */
.quad 0x0000000000030d40 /* 15 */
.quad 0 /* 16 */
.quad 0 /* 17 */
.quad 0 /* 18 */
.quad 0 /* 19 */
.quad 0 /* 1a */
.quad 0 /* 1b */
.quad 0 /* 1c */
.p2align
write_dumpreg:
ld $t2, 0($t6)
sd $t2, 0($t4)
addiu $t4, $t4, GRUB_CPU_LOONGSON_DDR2_REG_STEP
jr $ra
addiu $t6, $t6, GRUB_CPU_LOONGSON_DDR2_REG_SIZE
continue:
lui $t4, %hi(GRUB_CPU_LOONGSON_DDR2_BASE)
addiu $t4, $t4, %lo(GRUB_CPU_LOONGSON_DDR2_BASE)
lui $t6, %hi(regdump)
/* 0 */
bal write_dumpreg
addiu $t6, $t6, %lo(regdump)
/* 1 */
ori $a1, $a1, GRUB_SMB_RAM_START_ADDR
move $t8, $zero
lui $t5, 0x0001
bal read_spd
ori $a0, $zero, GRUB_SMBUS_SPD_MEMORY_NUM_BANKS_ADDR
ori $t7, $zero, 8
bne $v0, $t7, 1f
ori $t5, $t5, 0x0001
ori $t8, $t8, GRUB_CPU_LOONGSON_DDR2_REG1_HI_8BANKS
1:
dsll $t8, $t8, 32
or $t5, $t5, $t8
sd $t5, 0 ($t4)
addiu $t4, $t4, GRUB_CPU_LOONGSON_DDR2_REG_STEP
/* 2 */
bal write_dumpreg
nop
/* 3 */
bal write_dumpreg
nop
/* 4 */
bal write_dumpreg
nop
/* 5 */
/* FIXME: figure termination resistance. */
ori $t5, $zero, 0x2
bal read_spd
ori $a0, $zero, GRUB_SMBUS_SPD_MEMORY_NUM_ROWS_ADDR
/* $v0 = 15 - $v0. */
xori $v0, $v0, 0xf
andi $v0, $v0, 0x7
sll $v0, $v0, 8
or $t5, $t5, $v0
/* Find the fastest supported CAS latency. */
bal read_spd
ori $a0, $zero, GRUB_SMBUS_SPD_MEMORY_CAS_LATENCY_ADDR
ori $t0, $zero, GRUB_SMBUS_SPD_MEMORY_CAS_LATENCY_MIN_VALUE
ori $t1, $zero, (1 << GRUB_SMBUS_SPD_MEMORY_CAS_LATENCY_MIN_VALUE)
2:
and $t2, $t1, $v0
bne $t2, $zero, 1f
ori $t3, $zero, 8
lui $a0, %hi(no_cas_latency)
beq $t0, $t3, fatal
addiu $a0, $a0, %lo(no_cas_latency)
addiu $t0, $t0, 1
b 2b
sll $t1, $t1, 1
1:
sll $t0, $t0, 16
or $t5, $t5, $t0
bal read_spd
ori $a0, $zero, GRUB_SMBUS_SPD_MEMORY_NUM_COLUMNS_ADDR
/* $v0 = 15 - ($v0 + 1) = 14 - $v0. */
addiu $v0, $v0, 1
xori $v0, $v0, 0xf
andi $v0, $v0, 0x7
sll $v0, 24
or $t5, $t5, $v0
sd $t5, 0 ($t4)
addiu $t4, $t4, GRUB_CPU_LOONGSON_DDR2_REG_STEP
ori $t7, $zero, 0x16
1:
ld $t2, 0($t6)
sd $t2, 0($t4)
addiu $t4, $t4, GRUB_CPU_LOONGSON_DDR2_REG_STEP
addiu $t7, $t7, -1
bne $t7, $zero, 1b
addiu $t6, $t6, GRUB_CPU_LOONGSON_DDR2_REG_SIZE
lui $t4, %hi(GRUB_CPU_LOONGSON_DDR2_BASE)
ld $t5, (%lo(GRUB_CPU_LOONGSON_DDR2_BASE) + 0x30) ($t4)
ori $t0, $zero, 1
dsll $t0, $t0, 40
or $t5, $t5, $t0
sd $t5, (%lo(GRUB_CPU_LOONGSON_DDR2_BASE) + 0x30) ($t4)
/* Desactivate DDR2 registers. */
lui $t0, %hi (GRUB_CPU_LOONGSON_CORECFG)
ld $t1, %lo (GRUB_CPU_LOONGSON_CORECFG) ($t0)
ori $t1, $t1, GRUB_CPU_LOONGSON_CORECFG_DISABLE_DDR2_SPACE
sd $t1, %lo (GRUB_CPU_LOONGSON_CORECFG) ($t0)
/* Enable cache. */
mfc0 $t0, GRUB_CPU_LOONGSON_COP0_CACHE_CONFIG
addiu $t1, $zero, ~GRUB_CPU_LOONGSON_CACHE_TYPE_MASK
and $t0, $t1, $t1
/* Set line size to 32 bytes and disabled cache. */
ori $t0, $t0, (GRUB_CPU_LOONGSON_COP0_CACHE_CONFIG_ILINESIZE \
| GRUB_CPU_LOONGSON_COP0_CACHE_CONFIG_DLINESIZE \
| GRUB_CPU_LOONGSON_CACHE_ACCELERATED)
mtc0 $t0, GRUB_CPU_LOONGSON_COP0_CACHE_CONFIG
/* Invalidate all I-cache entries. */
srl $t1, $t0, GRUB_CPU_LOONGSON_COP0_CACHE_ISIZE_SHIFT
andi $t1, $t1, GRUB_CPU_LOONGSON_COP0_CACHE_SIZE_MASK
ori $t2, $zero, (1 << (GRUB_CPU_LOONGSON_COP0_CACHE_SIZE_OFFSET \
- GRUB_CPU_LOONGSON_CACHE_LINE_SIZE_LOG_BIG \
- GRUB_CPU_LOONGSON_I_CACHE_LOG_WAYS))
sll $t1, $t2, $t1
lui $t2, 0x8000
1:
cache GRUB_CPU_LOONGSON_COP0_I_INDEX_INVALIDATE, 0($t2)
addiu $t1, $t1, -1
bne $t1, $zero, 1b
addiu $t2, $t2, (1 << GRUB_CPU_LOONGSON_COP0_I_INDEX_BIT_OFFSET)
/* Invalidate all D-cache entries. */
srl $t1, $t0, GRUB_CPU_LOONGSON_COP0_CACHE_DSIZE_SHIFT
andi $t1, $t1, GRUB_CPU_LOONGSON_COP0_CACHE_SIZE_MASK
ori $t2, $zero, (1 << (GRUB_CPU_LOONGSON_COP0_CACHE_SIZE_OFFSET \
- GRUB_CPU_LOONGSON_CACHE_LINE_SIZE_LOG_BIG \
- GRUB_CPU_LOONGSON_D_CACHE_LOG_WAYS))
sll $t1, $t2, $t1
lui $t2, 0x8000
mtc0 $zero, GRUB_CPU_LOONGSON_COP0_CACHE_TAGLO
mtc0 $zero, GRUB_CPU_LOONGSON_COP0_CACHE_TAGHI
1:
/* All four ways. */
cache GRUB_CPU_LOONGSON_COP0_D_INDEX_TAG_STORE, 0($t2)
cache GRUB_CPU_LOONGSON_COP0_D_INDEX_TAG_STORE, 1($t2)
cache GRUB_CPU_LOONGSON_COP0_D_INDEX_TAG_STORE, 2($t2)
cache GRUB_CPU_LOONGSON_COP0_D_INDEX_TAG_STORE, 3($t2)
addiu $t1, $t1, -1
bne $t1, $zero, 1b
addiu $t2, $t2, (1 << GRUB_CPU_LOONGSON_COP0_D_INDEX_BIT_OFFSET)
/* Invalidate all S-cache entries. */
ori $t1, $zero, (1 << (GRUB_CPU_LOONGSON_SECONDARY_CACHE_LOG_SIZE \
- GRUB_CPU_LOONGSON_CACHE_LINE_SIZE_LOG_BIG \
- GRUB_CPU_LOONGSON_S_CACHE_LOG_WAYS))
lui $t2, 0x8000
mtc0 $zero, GRUB_CPU_LOONGSON_COP0_CACHE_TAGLO
mtc0 $zero, GRUB_CPU_LOONGSON_COP0_CACHE_TAGHI
1:
/* All four ways. */
cache GRUB_CPU_LOONGSON_COP0_S_INDEX_TAG_STORE, 0($t2)
cache GRUB_CPU_LOONGSON_COP0_S_INDEX_TAG_STORE, 1($t2)
cache GRUB_CPU_LOONGSON_COP0_S_INDEX_TAG_STORE, 2($t2)
cache GRUB_CPU_LOONGSON_COP0_S_INDEX_TAG_STORE, 3($t2)
addiu $t1, $t1, -1
bne $t1, $zero, 1b
addiu $t2, $t2, (1 << GRUB_CPU_LOONGSON_COP0_D_INDEX_BIT_OFFSET)
/* Finally enable cache. */
mfc0 $t0, GRUB_CPU_LOONGSON_COP0_CACHE_CONFIG
addiu $t1, $zero, ~GRUB_CPU_LOONGSON_CACHE_TYPE_MASK
and $t0, $t1, $t1
ori $t0, $t0, GRUB_CPU_LOONGSON_CACHE_CACHED
mtc0 $t0, GRUB_CPU_LOONGSON_COP0_CACHE_CONFIG
lui $a0, %hi(caches_enabled)
bal message
addiu $a0, $a0, %lo(caches_enabled)
/* Set ROM delay cycles to 1. */
lui $t0, %hi(GRUB_CPU_LOONGSON_LIOCFG)
lw $t1, %lo(GRUB_CPU_LOONGSON_LIOCFG) ($t0)
addiu $t2, $zero, ~(GRUB_CPU_LOONGSON_ROM_DELAY_MASK \
<< GRUB_CPU_LOONGSON_ROM_DELAY_OFFSET)
and $t1, $t1, $t2
ori $t1, $t1, (1 << GRUB_CPU_LOONGSON_ROM_DELAY_OFFSET)
sw $t1, %lo(GRUB_CPU_LOONGSON_LIOCFG) ($t0)
addiu $a0, $zero, -1
addiu $a1, $zero, -1
/* Take advantage of cache. */
lui $t0, %hi(cached_continue - 0x20000000)
addiu $t0, $t0, %lo(cached_continue - 0x20000000)
jr $t0
addiu $a2, $zero, -1
cached_continue:
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