mirror of
https://github.com/torvalds/linux.git
synced 2024-10-31 17:21:49 +00:00
c1a144d77a
Original port to early 2.6 kernel using TI COFF toolchain. Brought up to date by Mark Salter <msalter@redhat.com> This patch provides the early boot code for C6X architecture. There is a 16 entry vector table which is used to direct reset and interrupt events. The vector table entries contain a small amount of code (maximum of 8 opcodes) which simply branches to the actual event handling code. The head.S code simply clears BSS, setups up a few control registers, and calls machine_init followed by start_kernel. The machine_init code in setup.c does the early flat tree parsing (memory, commandline, etc). At setup_arch time, the code does the usual memory setup and minimally scans the devicetree for any needed information. Signed-off-by: Aurelien Jacquiot <a-jacquiot@ti.com> Signed-off-by: Mark Salter <msalter@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
85 lines
1.7 KiB
ArmAsm
85 lines
1.7 KiB
ArmAsm
;
|
|
; Port on Texas Instruments TMS320C6x architecture
|
|
;
|
|
; Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
|
|
; Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
|
|
;
|
|
; This program is free software; you can redistribute it and/or modify
|
|
; it under the terms of the GNU General Public License version 2 as
|
|
; published by the Free Software Foundation.
|
|
;
|
|
#include <linux/linkage.h>
|
|
#include <linux/of_fdt.h>
|
|
#include <asm/asm-offsets.h>
|
|
|
|
__HEAD
|
|
ENTRY(_c_int00)
|
|
;; Save magic and pointer
|
|
MV .S1 A4,A10
|
|
MV .S2 B4,B10
|
|
MVKL .S2 __bss_start,B5
|
|
MVKH .S2 __bss_start,B5
|
|
MVKL .S2 __bss_stop,B6
|
|
MVKH .S2 __bss_stop,B6
|
|
SUB .L2 B6,B5,B6 ; bss size
|
|
|
|
;; Set the stack pointer
|
|
MVKL .S2 current_ksp,B0
|
|
MVKH .S2 current_ksp,B0
|
|
LDW .D2T2 *B0,B15
|
|
|
|
;; clear bss
|
|
SHR .S2 B6,3,B0 ; number of dwords to clear
|
|
ZERO .L2 B13
|
|
ZERO .L2 B12
|
|
bss_loop:
|
|
BDEC .S2 bss_loop,B0
|
|
NOP 3
|
|
CMPLT .L2 B0,0,B1
|
|
[!B1] STDW .D2T2 B13:B12,*B5++[1]
|
|
|
|
NOP 4
|
|
AND .D2 ~7,B15,B15
|
|
|
|
;; Clear GIE and PGIE
|
|
MVC .S2 CSR,B2
|
|
CLR .S2 B2,0,1,B2
|
|
MVC .S2 B2,CSR
|
|
MVC .S2 TSR,B2
|
|
CLR .S2 B2,0,1,B2
|
|
MVC .S2 B2,TSR
|
|
MVC .S2 ITSR,B2
|
|
CLR .S2 B2,0,1,B2
|
|
MVC .S2 B2,ITSR
|
|
MVC .S2 NTSR,B2
|
|
CLR .S2 B2,0,1,B2
|
|
MVC .S2 B2,NTSR
|
|
|
|
;; pass DTB pointer to machine_init (or zero if none)
|
|
MVKL .S1 OF_DT_HEADER,A0
|
|
MVKH .S1 OF_DT_HEADER,A0
|
|
CMPEQ .L1 A10,A0,A0
|
|
[A0] MV .S1X B10,A4
|
|
[!A0] MVK .S1 0,A4
|
|
|
|
#ifdef CONFIG_C6X_BIG_KERNEL
|
|
MVKL .S1 machine_init,A0
|
|
MVKH .S1 machine_init,A0
|
|
B .S2X A0
|
|
ADDKPC .S2 0f,B3,4
|
|
0:
|
|
#else
|
|
CALLP .S2 machine_init,B3
|
|
#endif
|
|
|
|
;; Jump to Linux init
|
|
#ifdef CONFIG_C6X_BIG_KERNEL
|
|
MVKL .S1 start_kernel,A0
|
|
MVKH .S1 start_kernel,A0
|
|
B .S2X A0
|
|
#else
|
|
B .S2 start_kernel
|
|
#endif
|
|
NOP 5
|
|
L1: BNOP .S2 L1,5
|