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>
84 lines
1.7 KiB
ArmAsm
84 lines
1.7 KiB
ArmAsm
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; Port on Texas Instruments TMS320C6x architecture
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;
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; Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
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; Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
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;
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; This program is free software; you can redistribute it and/or modify
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; it under the terms of the GNU General Public License version 2 as
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; published by the Free Software Foundation.
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;
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#include <linux/linkage.h>
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#include <linux/of_fdt.h>
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#include <asm/asm-offsets.h>
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__HEAD
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ENTRY(_c_int00)
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;; Save magic and pointer
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MV .S1 A4,A10
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MV .S2 B4,B10
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MVKL .S2 __bss_start,B5
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MVKH .S2 __bss_start,B5
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MVKL .S2 __bss_stop,B6
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MVKH .S2 __bss_stop,B6
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SUB .L2 B6,B5,B6 ; bss size
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;; Set the stack pointer
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MVKL .S2 current_ksp,B0
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MVKH .S2 current_ksp,B0
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LDW .D2T2 *B0,B15
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;; clear bss
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SHR .S2 B6,3,B0 ; number of dwords to clear
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ZERO .L2 B13
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ZERO .L2 B12
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bss_loop:
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BDEC .S2 bss_loop,B0
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NOP 3
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CMPLT .L2 B0,0,B1
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[!B1] STDW .D2T2 B13:B12,*B5++[1]
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NOP 4
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AND .D2 ~7,B15,B15
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;; Clear GIE and PGIE
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MVC .S2 CSR,B2
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CLR .S2 B2,0,1,B2
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MVC .S2 B2,CSR
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MVC .S2 TSR,B2
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CLR .S2 B2,0,1,B2
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MVC .S2 B2,TSR
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MVC .S2 ITSR,B2
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CLR .S2 B2,0,1,B2
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MVC .S2 B2,ITSR
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MVC .S2 NTSR,B2
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CLR .S2 B2,0,1,B2
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MVC .S2 B2,NTSR
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;; pass DTB pointer to machine_init (or zero if none)
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MVKL .S1 OF_DT_HEADER,A0
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MVKH .S1 OF_DT_HEADER,A0
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CMPEQ .L1 A10,A0,A0
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[A0] MV .S1X B10,A4
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[!A0] MVK .S1 0,A4
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#ifdef CONFIG_C6X_BIG_KERNEL
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MVKL .S1 machine_init,A0
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MVKH .S1 machine_init,A0
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B .S2X A0
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ADDKPC .S2 0f,B3,4
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0:
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#else
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CALLP .S2 machine_init,B3
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#endif
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;; Jump to Linux init
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#ifdef CONFIG_C6X_BIG_KERNEL
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MVKL .S1 start_kernel,A0
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MVKH .S1 start_kernel,A0
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B .S2X A0
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#else
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B .S2 start_kernel
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#endif
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NOP 5
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L1: BNOP .S2 L1,5
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