diff options
Diffstat (limited to 'nuttx/arch/sh/src/sh1/sh1_head.S')
| -rw-r--r-- | nuttx/arch/sh/src/sh1/sh1_head.S | 339 |
1 files changed, 339 insertions, 0 deletions
diff --git a/nuttx/arch/sh/src/sh1/sh1_head.S b/nuttx/arch/sh/src/sh1/sh1_head.S new file mode 100644 index 000000000..f93ca8e6d --- /dev/null +++ b/nuttx/arch/sh/src/sh1/sh1_head.S @@ -0,0 +1,339 @@ +/***************************************************************************** + * arch/sh/src/sh1/sh1_head.S + * + * Copyright (C) 2008 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + *****************************************************************************/ + +/***************************************************************************** + * Included Files + *****************************************************************************/ + +#include <nuttx/config.h> /* NuttX configuration settings */ +#include <arch/board/board.h> /* Board-specific settings */ +#include <arch/irq.h> /* IRQ definitons */ + +#include "chip.h" /* Chip-specific settings */ +#include "up_internal.h" +#include "up_arch.h" + +/***************************************************************************** + * Definitions + *****************************************************************************/ + +/* This file holds the NuttX start logic that runs when the SH-1/US7032EVB1 + * is reset. This logic must be located in SRAM at 0x0a00:2000. On that + * platform, the entire PROM and the first 8Kb of SRAM are reserved for CMON. + */ + +/***************************************************************************** + * External references + *****************************************************************************/ + +/* Called functions */ + + .globl _up_lowsetup /* Early initialization of UART */ +#ifdef CONFIG_USE_EARLYSERIALINIT + .globl _up_earlyserialinit /* Early initialization of serial driver */ +#endif +#ifdef CONFIG_ARCH_LEDS + .globl _up_ledinit /* Boot LED setup */ +#endif +#ifdef CONFIG_DEBUG + .globl _up_lowputc /* Low-level debug output */ +#endif + .globl _os_start /* NuttX entry point */ + +/* Variables set up by the linker script */ + + .globl _sbss /* Start of BSS */ + .globl _ebss /* End of BSS */ + +#ifdef CONFIG_BOOT_FROM_FLASH + .globl _eronly /* Where .data defaults are stored in FLASH */ + .global _sdata /* Start of .data in RAM */ + .globl _edata /* End of .data in RAM */ +#endif + +/***************************************************************************** + * Macros + *****************************************************************************/ + +/***************************************************************************** + * Name: showprogress + * + * Description: + * Print a character on the UART to show boot status. This macro will + * modify r0, r1, r2 and r14 + * + *****************************************************************************/ + + .macro showprogress, code +#ifdef CONFIG_DEBUG + mov r0, #\code + bl up_lowputc + mov.l .Llowputc, r0 /* Address of up_earlyserialinit */ + jsr @r0 /* Call it */ + or r0, r0 /* Delay slot */ +#endif + .endm + +/***************************************************************************** + * Vectors + *****************************************************************************/ + + .section .vect + +/***************************************************************************** + * Name: __vector_table + * + * Description: + * Interrupt vector table. The actual vectors are managed by CMON. For + * any non-zero settings in the following table, CMON will redirect interrupt + * handling to that function. + * + *****************************************************************************/ + + .globl __vector_table + .type __vector_table, %object +__vector_table: + /* Resets */ + + .long __start /* 0-1: Power-on reset (hard, NMI high) PC & SP */ + .long _ebss+CONFIG_PROC_STACK_SIZE-4 + .long __start /* 2-3: Manual reset (soft, NMI low) PC & SP */ + .long _ebss+CONFIG_PROC_STACK_SIZE-4 + + .rept 252 + .long 0 + .endr + + .size __vector_table, . - __vector_table + +/***************************************************************************** + * Text + *****************************************************************************/ + + .section .text + +/***************************************************************************** + * Name: __start + * + * Description: + * Reset entry point. This is the first function to execute when the + * processor is reset. It initializes hardware and then gives control to + * NuttX. Nearly all SH-1 resources have already been setup by CMON so all + * that is necessary for us to do here is setup the stack pointer and BSS. + * + *****************************************************************************/ + + .global __start + .type __start, #function + +__start: + /* Initialize stack pointer to the preallocated stack */ + mov.l .Lstack, r15 + + /* set up the bus controller for the EVB */ + + mov.l .Lwcr1, r0 + sub r1,r1 + mov.w r1, @r0 + + /* Configure the BSR to use /LBS, /HBS, /WR */ + + mov.l .Lbcr, r0 + mov.w .Lbas, r1 + bra __start0 + mov.w r1, @r0 + + .align 2 +.Lstack: + .long _ebss+CONFIG_PROC_STACK_SIZE-4 +.Lwcr1: + .long 0x5ffffa2 +.Lbcr: + .long 0x5ffffa0 +.Lbas: + .word 0x0800 + +__start0: + /* Copy the monitor vectors to a002000-a00211f */ + + mov #0, r0 /* R0: Monitor vector table at address 0 in PROM */ + mov.l .Lramvectab, r1 /* R1: Redirected vector table in SRAM */ + mov.l .Lvectend, r3 /* R3: Copy only up to external interrupts */ +1: + mov.l @r0, r2 /* R2: Value from mnitor monitor vector table */ + mov.l r2, @r1 /* Write into SRAM vector table */ + add #4, r0 /* R0: Address of next vector to read from monitor vector table */ + add #4, r1 /* R1: Address of next vector to write to SRAM vector table */ + cmp/gt r0, r3 /* Copy only only up to external interrupts at */ + bt 1b /* Continue looping until all copied */ + + /* Update the VBR to show new adddress of vector table */ + + mov.l .Lramvectab, r0 /* R0: Address of SRAM vector table */ + ldc r0, vbr /* Set VBR to start of SRAM vector table */ + + /* Initialize data segement */ + +#ifdef CONFIG_BOOT_FROM_FLASH + mov.l .Lsdata, r0 /* R0: Start of .data segment */ + mov.l .Ledata, r1 /* R1: End+1 of .data segment */ + mov.l .Leronly, r2 /* R2: Start of FLASH .data segment copy */ +2: + mov.l @r2, r3 /* R3: Next byte from FLASH copy */ + mov.l r3, @r0 /* Copy to .data */ + add #4, r2 /* R2: Address of next byte to read from FLASH */ + add #4, r0 /* R0: Address to write next byte to .data */ + cmp/gt r0, r1 /* End of .data? */ + bt 2b /* Loop until end of data */ +#endif + + /* Clear BSS */ + + mov.l .Lsbss, r0 /* R0: Start of BSS segment */ + mov.l .Lebss, r1 /* R1: End+1 of BSS segment */ + mov #0, r2 /* R2: Value = 0 */ +3: + mov.l r2, @r0 /* Clear the next word in BSS */ + add #4, r0 /* R0: Address of next byte to clear in BSS */ + cmp/ge r0, r1 /* End of BSS? */ + bt 3b /* Loop until the end of BSS */ + + /* Configure the uart so that we can get debug output as soon + * as possible. + */ + + mov.l .Llowsetup, r0 /* Address of up_lowsetup */ + jsr @r0 /* Call it */ + or r0, r0 /* Delay slot */ + + showprogress 'A' + + /* Perform early serial initialization */ + +#ifdef CONFIG_USE_EARLYSERIALINIT + mov.l .Learlyser, r0 /* Address of up_earlyserialinit */ + jsr @r0 /* Call it */ + or r0, r0 /* Delay slot */ +#endif + + showprogress 'B' + + /* Call C++ constructors */ + +#ifdef CONFIG_CPLUSPLUS +# warning "No C++ support yet" + showprogress 'C' +#endif + showprogress '\n' + + /* Initialize onboard LEDs */ + +#ifdef CONFIG_ARCH_LEDS + mov.l .Lledinit, r0 /* Address of up_ledinit */ + jsr @r0 /* Call it */ + or r0, r0 /* Delay slot */ +#endif + + /* Then jump to NuttX entry */ + + mov.l .Losstart,r0 + jsr @r0 + or r0, r0 + + /* Shouldn't get here */ + + /* Call destructors -- never get here */ + +#ifdef CONFIG_CPLUSPLUS +# warning "No C++ support yet" +#endif + +4: nop + bra 4b + nop + + .align 2 +#ifdef CONFIG_BOOT_FROM_FLASH +.Leronly: + .long _eronly +.Lsdata: + .long _sdata +.Ledata: + .long _edata +#endif +.Lsbss: + .long _sbss +.Lebss: + .long _ebss +#ifdef CONFIG_USE_EARLYSERIALINIT +.Learlyser: + .long _up_earlyserialinit +#endif +.Llowsetup: + .long _up_lowsetup +#ifdef CONFIG_DEBUG +.Llowputc: + .long _up_lowputc +#endif +.Lledinit: + .long _up_ledinit +.Losstart: + .long _os_start +.Lramvectab: + .long 0xa002000 +.Lvectend: + .long (SH1_IRQ7_VECOFFSET+3) + +/***************************************************************************** + * DATA + *****************************************************************************/ + + .section .data + + /* This global variable is unsigned long g_heapbase and is + * exported from here only because of its coupling to the stack + * above. + */ + + .data + .align 4 + .globl g_heapbase + .type g_heapbase, object +g_heapbase: + .long _ebss+CONFIG_PROC_STACK_SIZE + .size g_heapbase, .-g_heapbase + + .end + |