C6X: early boot code
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>
diff --git a/arch/c6x/kernel/vectors.S b/arch/c6x/kernel/vectors.S
new file mode 100644
index 0000000..c95c66f
--- /dev/null
+++ b/arch/c6x/kernel/vectors.S
@@ -0,0 +1,81 @@
+;
+; Port on Texas Instruments TMS320C6x architecture
+;
+; Copyright (C) 2004, 2006, 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.
+;
+; This section handles all the interrupt vector routines.
+; At RESET the processor sets up the DRAM timing parameters and
+; branches to the label _c_int00 which handles initialization for the C code.
+;
+
+#define ALIGNMENT 5
+
+ .macro IRQVEC name, handler
+ .align ALIGNMENT
+ .hidden \name
+ .global \name
+\name:
+#ifdef CONFIG_C6X_BIG_KERNEL
+ STW .D2T1 A0,*B15--[2]
+ || MVKL .S1 \handler,A0
+ MVKH .S1 \handler,A0
+ B .S2X A0
+ LDW .D2T1 *++B15[2],A0
+ NOP 4
+ NOP
+ NOP
+ .endm
+#else /* CONFIG_C6X_BIG_KERNEL */
+ B .S2 \handler
+ NOP
+ NOP
+ NOP
+ NOP
+ NOP
+ NOP
+ NOP
+ .endm
+#endif /* CONFIG_C6X_BIG_KERNEL */
+
+ .sect ".vectors","ax"
+ .align ALIGNMENT
+ .global RESET
+ .hidden RESET
+RESET:
+#ifdef CONFIG_C6X_BIG_KERNEL
+ MVKL .S1 _c_int00,A0 ; branch to _c_int00
+ MVKH .S1 _c_int00,A0
+ B .S2X A0
+#else
+ B .S2 _c_int00
+ NOP
+ NOP
+#endif
+ NOP
+ NOP
+ NOP
+ NOP
+ NOP
+
+
+ IRQVEC NMI,_nmi_handler ; NMI interrupt
+ IRQVEC AINT,_bad_interrupt ; reserved
+ IRQVEC MSGINT,_bad_interrupt ; reserved
+
+ IRQVEC INT4,_int4_handler
+ IRQVEC INT5,_int5_handler
+ IRQVEC INT6,_int6_handler
+ IRQVEC INT7,_int7_handler
+ IRQVEC INT8,_int8_handler
+ IRQVEC INT9,_int9_handler
+ IRQVEC INT10,_int10_handler
+ IRQVEC INT11,_int11_handler
+ IRQVEC INT12,_int12_handler
+ IRQVEC INT13,_int13_handler
+ IRQVEC INT14,_int14_handler
+ IRQVEC INT15,_int15_handler