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Updates from Eric Norum.

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This commit is contained in:
Joel Sherrill
1996-05-01 15:25:33 +00:00
parent dce1c1a10a
commit 996a9cb4e2
7 changed files with 269 additions and 107 deletions
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5
c/src/lib/libbsp/m68k/gen68360/README
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@@ -4,9 +4,8 @@
#
# This package requires a version of GCC that has been modified
# to support the `-m68360' argument. I have submitted the required changes
# to the GCC maintainers. Should they choose to use a different argument
# (-mcpu32 perhaps) this board support package will have to be changed.
# to support the `-mcpu32' argument. I have submitted the required
# changes to the GCC maintainers.
#
#

2
c/src/lib/libbsp/m68k/gen68360/include/bsp.h
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@@ -118,6 +118,8 @@ extern m68k_isr_entry M68Kvec[]; /* vector table address */
void bsp_cleanup( void );
void M360ExecuteRISC( rtems_unsigned16 command );
m68k_isr_entry set_vector(
rtems_isr_entry handler,
rtems_vector_number vector,

46
c/src/lib/libbsp/m68k/gen68360/start/start360.s
View File

@@ -298,11 +298,11 @@ uhoh: nop | Leave spot for breakpoint
bra.s uhoh | Stuck forever
/*
* Place the low-order 3 octets of the board's
* ethernet address at a `well-known' location.
* Place the low-order 3 octets of the board's ethernet address at
* a `well-known' fixed location relative to the beginning of ROM.
*/
.align 2
| .long ETHERNET_ADDRESS | 08: Low-order 3 octets
.long ETHERNET_ADDRESS | Low-order 3 octets of ethernet address
/*
* Initial PC
@@ -347,24 +347,36 @@ start:
*/
jmp SYM(_Init68360) | Start C code (which never returns)
/*
* Clear BSS, set up real stack, initialize heap, start C program
* Assume that BSS size is a multiple of 4.
* FIXME: The zero-loop should be changed to put the CPU into loop-mode.
* FIXME: PROM-based systems will have to copy data segment to RAM here
* Copy DATA segment, clear BSS segment, set up real stack,
* initialize heap, start C program.
* Assume that DATA and BSS sizes are multiples of 4.
*/
PUBLIC (_ClearBSSAndStart)
SYM(_ClearBSSAndStart):
movel #clear_start,a0
movel #clear_end,a1
clrl d0
bras ZEROLOOPTEST
PUBLIC (_CopyDataClearBSSAndStart)
SYM(_CopyDataClearBSSAndStart):
lea copy_start,a0 | Get start of DATA in RAM
lea SYM(etext),a2 | Get start of DATA in ROM
cmpl a0,a2 | Are they the same?
beq.s NOCOPY | Yes, no copy necessary
lea copy_end,a1 | Get end of DATA in RAM
bra.s COPYLOOPTEST | Branch into copy loop
COPYLOOP:
movel a2@+,a0@+ | Copy word from ROM to RAM
COPYLOOPTEST:
cmpl a1,a0 | Done?
bcs.s COPYLOOP | No, skip
NOCOPY:
lea clear_start,a0 | Get start of BSS
lea clear_end,a1 | Get end of BSS
clrl d0 | Value to set
bra.s ZEROLOOPTEST | Branch into clear loop
ZEROLOOP:
movel d0,a0@+
movel d0,a0@+ | Clear a word
ZEROLOOPTEST:
cmpl a1,a0
bcs ZEROLOOP
cmpl a1,a0 | Done?
bcs.s ZEROLOOP | No, skip
movel #stack_init,a7 | set master stack pointer
movel d0,a7@- | environp
movel d0,a7@- | argv

46
c/src/lib/libbsp/m68k/gen68360/start360/start360.s
View File

@@ -298,11 +298,11 @@ uhoh: nop | Leave spot for breakpoint
bra.s uhoh | Stuck forever
/*
* Place the low-order 3 octets of the board's
* ethernet address at a `well-known' location.
* Place the low-order 3 octets of the board's ethernet address at
* a `well-known' fixed location relative to the beginning of ROM.
*/
.align 2
| .long ETHERNET_ADDRESS | 08: Low-order 3 octets
.long ETHERNET_ADDRESS | Low-order 3 octets of ethernet address
/*
* Initial PC
@@ -347,24 +347,36 @@ start:
*/
jmp SYM(_Init68360) | Start C code (which never returns)
/*
* Clear BSS, set up real stack, initialize heap, start C program
* Assume that BSS size is a multiple of 4.
* FIXME: The zero-loop should be changed to put the CPU into loop-mode.
* FIXME: PROM-based systems will have to copy data segment to RAM here
* Copy DATA segment, clear BSS segment, set up real stack,
* initialize heap, start C program.
* Assume that DATA and BSS sizes are multiples of 4.
*/
PUBLIC (_ClearBSSAndStart)
SYM(_ClearBSSAndStart):
movel #clear_start,a0
movel #clear_end,a1
clrl d0
bras ZEROLOOPTEST
PUBLIC (_CopyDataClearBSSAndStart)
SYM(_CopyDataClearBSSAndStart):
lea copy_start,a0 | Get start of DATA in RAM
lea SYM(etext),a2 | Get start of DATA in ROM
cmpl a0,a2 | Are they the same?
beq.s NOCOPY | Yes, no copy necessary
lea copy_end,a1 | Get end of DATA in RAM
bra.s COPYLOOPTEST | Branch into copy loop
COPYLOOP:
movel a2@+,a0@+ | Copy word from ROM to RAM
COPYLOOPTEST:
cmpl a1,a0 | Done?
bcs.s COPYLOOP | No, skip
NOCOPY:
lea clear_start,a0 | Get start of BSS
lea clear_end,a1 | Get end of BSS
clrl d0 | Value to set
bra.s ZEROLOOPTEST | Branch into clear loop
ZEROLOOP:
movel d0,a0@+
movel d0,a0@+ | Clear a word
ZEROLOOPTEST:
cmpl a1,a0
bcs ZEROLOOP
cmpl a1,a0 | Done?
bcs.s ZEROLOOP | No, skip
movel #stack_init,a7 | set master stack pointer
movel d0,a7@- | environp
movel d0,a7@- | argv

39
c/src/lib/libbsp/m68k/gen68360/startup/init68360.c
View File

@@ -1,5 +1,5 @@
/*
* Initialize 68360 hardware
* MC68360 support routines
*
* W. Eric Norum
* Saskatchewan Accelerator Laboratory
@@ -12,15 +12,33 @@
#include <rtems.h>
#include <bsp.h>
#include "m68360.h"
#include <m68360.h>
void
_Init68360 (void)
/*
* Send a command to the CPM RISC processer
*/
void M360ExecuteRISC(rtems_unsigned16 command)
{
rtems_unsigned16 sr;
m68k_disable_interrupts (sr);
while (m360.cr & M360_CR_FLG)
continue;
m360.cr = command | M360_CR_FLG;
m68k_enable_interrupts (sr);
}
/*
* Initialize MC68360
*/
void _Init68360 (void)
{
int i;
extern void *_RomBase, *_RamBase;
m68k_isr_entry *vbr;
extern void _ClearBSSAndStart (void);
extern void _CopyDataClearBSSAndStart (void);
/*
* Step 6: Is this a power-up reset?
@@ -64,7 +82,7 @@ _Init68360 (void)
*((long *)((char *)&m360 + 0xE00 + i)) = 0;
*((long *)((char *)&m360 + 0xF00 + i)) = 0;
}
m360.cr = M360_CR_RST | M360_CR_FLG;
M360ExecuteRISC (M360_CR_RST);
/*
* Step 10: Write PEPAR
@@ -129,11 +147,10 @@ _Init68360 (void)
/*
* Step 13: Copy the exception vector table to system RAM
*/
m68k_get_vbr( vbr );
m68k_get_vbr (vbr);
for (i = 0; i < 256; ++i)
M68Kvec[i] = vbr[i];
m68k_set_vbr( M68Kvec );
m68k_set_vbr (M68Kvec);
/*
* Step 14: More system initialization
@@ -167,7 +184,7 @@ _Init68360 (void)
m360.mcr = 0x4C7F;
/*
* Clear BSS, switch stacks and call main()
* Copy data, clear BSS, switch stacks and call main()
*/
_ClearBSSAndStart ();
_CopyDataClearBSSAndStart ();
}

127
c/src/lib/libbsp/m68k/gen68360/startup/linkcmds
View File

@@ -13,84 +13,93 @@
* Declare on-board memory
*/
MEMORY {
ram : ORIGIN = 0x00000000, LENGTH = 4M
rom : ORIGIN = 0xFF000000, LENGTH = 1M
dpram : ORIGIN = 0xFE000000, LENGTH = 8k
ram : ORIGIN = 0x00000000, LENGTH = 4M
rom : ORIGIN = 0xFF000000, LENGTH = 1M
dpram : ORIGIN = 0xFE000000, LENGTH = 8k
}
/*
* Declare some sizes
* XXX: The assignment of ". += XyzSize;" fails in older gld's if the
* number used there is not constant. If this happens to you, edit
* the lines marked below to use a constant value.
*/
/*
* XXX: The assignment of ". += XyzSize;" fails in older gld's if the
* number used there is not constant so the calculated sizes are
* ignored below and the default number is used instead.
*/
HeapSize = DEFINED(HeapSize) ? HeapSize : 0x10000;
StackSize = DEFINED(StackSize) ? StackSize : 0x1000;
/*
* Declare low-order three octets of Ethernet address
*/
ETHERNET_ADDRESS = DEFINED(ETHERNET_ADDRESS) ? ETHERNET_ADDRESS : 0xDEAD12;
/*
* Load objects
*/
SECTIONS {
/*
* Boot PROM
*/
rom : {
_RomBase = .;
__RomBase = .;
} >rom
/*
* Dynamic RAM
*/
ram : {
_RamBase = .;
__RamBase = .;
} >ram
/*
* Text, data and bss segments
*/
.text : {
_RamBase = .;
__RamBase = .;
CREATE_OBJECT_SYMBOLS
*(.text)
. = ALIGN (16);
_etext = .;
CREATE_OBJECT_SYMBOLS
*(.text)
. = ALIGN (16);
etext = .;
_etext = .;
} >ram
.data : {
*(.data)
. = ALIGN (16);
_edata = .;
copy_start = .;
*(.data)
. = ALIGN (16);
_edata = .;
copy_end = .;
} >ram
.bss : {
M68Kvec = .;
_M68Kvec = .;
. += (256 * 4);
clear_start = .;
*(.bss)
*(COMMON)
. = ALIGN (16);
_end = .;
M68Kvec = .;
_M68Kvec = .;
. += (256 * 4);
clear_start = .;
*(.bss)
*(COMMON)
. = ALIGN (16);
_end = .;
_HeapStart = .;
__HeapStart = .;
/* XXX: Temporary to get around a gld bug
*
* . += HeapSize;
* . += StackSize;
*/
. += 0x10000; /* XXX */
. += 0x1000; /* XXX */
_HeapStart = .;
__HeapStart = .;
/* . += HeapSize; */ /* XXX -- Old gld can't handle this */
/* . += StackSize; */ /* XXX -- Old gld can't handle this */
. += 0x10000; /* HeapSize for old gld */
. += 0x1000; /* StackSize for old gld */
. = ALIGN (16);
stack_init = .;
clear_end = .;
. = ALIGN (16);
stack_init = .;
clear_end = .;
_WorkspaceBase = .;
__WorkspaceBase = .;
} >ram
_WorkspaceBase = .;
__WorkspaceBase = .;
} >ram
/*
* On-chip memory/peripherals
*/
dpram : {
m360 = .;
_m360 = .;
. += (8 * 1024);
/*
* On-chip memory/peripherals
*/
dpram : {
m360 = .;
_m360 = .;
. += (8 * 1024);
} >dpram
/*
* Boot PROM
*/
rom : {
_RomBase = .;
__RomBase = .;
} >rom
} >dpram
}

111
c/src/lib/libbsp/m68k/gen68360/startup/linkcmds.prom Normal file
View File

@@ -0,0 +1,111 @@
/*
* This file contains GNU linker directives for a generic MC68360 board.
* These linker directives are for producing a PROM version..
* To create the PROM image from the linkter output you must use objcopy
* (--adjust-section-vma) to place the data segment at the end of the text
* segment in the PROM. The start-up code takes care of copying this region
* to RAM.
*
* Saskatchewan Accelerator Laboratory
* University of Saskatchewan
* Saskatoon, Saskatchewan, CANADA
* eric@skatter.usask.ca
*
* $Id$
*/
/*
* a.out format doesn't handle prom images very well
*/
OUTPUT_FORMAT(coff-m68k)
/*
* Declare on-board memory
*/
MEMORY {
ram : ORIGIN = 0x00000000, LENGTH = 4M
rom : ORIGIN = 0xFF000000, LENGTH = 1M
dpram : ORIGIN = 0xFE000000, LENGTH = 8k
}
/*
* Declare some sizes
*/
HeapSize = DEFINED(HeapSize) ? HeapSize : 0x10000;
StackSize = DEFINED(StackSize) ? StackSize : 0x1000;
/*
* Declare low-order three octets of Ethernet address
*/
ETHERNET_ADDRESS = DEFINED(ETHERNET_ADDRESS) ? ETHERNET_ADDRESS : 0xDEAD12;
/*
* Load objects
*/
SECTIONS {
/*
* Boot PROM
*/
rom : {
_RomBase = .;
__RomBase = .;
} >rom
/*
* Dynamic RAM
*/
ram : {
_RamBase = .;
__RamBase = .;
} >ram
/*
* Text, data and bss segments
*/
.text : {
CREATE_OBJECT_SYMBOLS
*(.text)
. = ALIGN (16);
etext = .;
_etext = .;
} >rom
.data : {
copy_start = .;
*(.data)
. = ALIGN (16);
_edata = .;
copy_end = .;
} >ram
.bss : {
M68Kvec = .;
_M68Kvec = .;
. += (256 * 4);
clear_start = .;
*(.bss)
*(COMMON)
. = ALIGN (16);
_end = .;
_HeapStart = .;
__HeapStart = .;
. += HeapSize;
. += StackSize;
. = ALIGN (16);
stack_init = .;
clear_end = .;
_WorkspaceBase = .;
__WorkspaceBase = .;
} >ram
/*
* On-chip memory/peripherals
*/
dpram : {
m360 = .;
_m360 = .;
. += (8 * 1024);
} >dpram
}