From 27b207fd0a0941b03f27e2a82c0468b1a090c745 Mon Sep 17 00:00:00 2001
From: wdenk <wdenk>
Date: Thu, 24 Jul 2003 23:38:38 +0000
Subject: * Implement new mechanism to export U-Boot's functions to standalone
applications: instead of using (PPC-specific) system calls we now use a
jump table; please see doc/README.standalone for details
* Patch by Dave Westwood, 24 Jul 2003:
added support for Unity OS (a proprietary OS)
---
cpu/mpc824x/drivers/i2c/i2c1.c | 11 ++++---
cpu/mpc824x/start.S | 69 +-----------------------------------------
2 files changed, 8 insertions(+), 72 deletions(-)
(limited to 'cpu/mpc824x')
diff --git a/cpu/mpc824x/drivers/i2c/i2c1.c b/cpu/mpc824x/drivers/i2c/i2c1.c
index dc1c97c..94c671e 100644
--- a/cpu/mpc824x/drivers/i2c/i2c1.c
+++ b/cpu/mpc824x/drivers/i2c/i2c1.c
@@ -1197,13 +1197,16 @@ int i2c_write (uchar chip, uint addr, int alen, uchar * buffer, int len)
uchar *p;
int i;
- p = dummy_buffer;
/* fill in address in big endian order */
- for (i=0; i<alen; ++i)
- *p++ = (addr >> (i * 8)) & 0xFF;
+ for (i=alen-1; i>=0; --i) {
+ buffer[i] = addr & 0xFF;
+ addr >>= 8;
+ }
/* fill in data */
+ p = dummy_buffer + alen;
+
for (i=0; i<len; ++i)
- *p++ = *buffer;
+ *p++ = *buffer++;
status = I2C_do_buffer (0, I2C_MASTER_XMIT, chip, alen + len,
dummy_buffer, I2C_STOP, 1, I2C_NO_RESTART);
diff --git a/cpu/mpc824x/start.S b/cpu/mpc824x/start.S
index b1cdb84..a22137c 100644
--- a/cpu/mpc824x/start.S
+++ b/cpu/mpc824x/start.S
@@ -259,74 +259,7 @@ ProgramCheck:
STD_EXCEPTION(EXC_OFF_DECR, Decrementer, timer_interrupt)
STD_EXCEPTION(0xa00, Trap_0a, UnknownException)
STD_EXCEPTION(0xb00, Trap_0b, UnknownException)
-
- . = 0xc00
-/*
- * r0 - SYSCALL number
- * r3-... arguments
- */
-SystemCall:
- addis r11,r0,0 /* get functions table addr */
- ori r11,r11,0 /* Note: this code is patched in trap_init */
- addis r12,r0,0 /* get number of functions */
- ori r12,r12,0
-
- cmplw 0, r0, r12
- bge 1f
-
- rlwinm r0,r0,2,0,31 /* fn_addr = fn_tbl[r0] */
- add r11,r11,r0
- lwz r11,0(r11)
-
- li r20,0xd00-4 /* Get stack pointer */
- lwz r12,0(r20)
- subi r12,r12,12 /* Adjust stack pointer */
- li r0,0xc00+_end_back-SystemCall
- cmplw 0, r0, r12 /* Check stack overflow */
- bgt 1f
- stw r12,0(r20)
-
- mflr r0
- stw r0,0(r12)
- mfspr r0,SRR0
- stw r0,4(r12)
- mfspr r0,SRR1
- stw r0,8(r12)
-
- li r12,0xc00+_back-SystemCall
- mtlr r12
- mtspr SRR0,r11
-
-1: SYNC
- rfi
-
-_back:
-
- mfmsr r11 /* Disable interrupts */
- li r12,0
- ori r12,r12,MSR_EE
- andc r11,r11,r12
- SYNC /* Some chip revs need this... */
- mtmsr r11
- SYNC
-
- li r12,0xd00-4 /* restore regs */
- lwz r12,0(r12)
-
- lwz r11,0(r12)
- mtlr r11
- lwz r11,4(r12)
- mtspr SRR0,r11
- lwz r11,8(r12)
- mtspr SRR1,r11
-
- addi r12,r12,12 /* Adjust stack pointer */
- li r20,0xd00-4
- stw r12,0(r20)
-
- SYNC
- rfi
-_end_back:
+ STD_EXCEPTION(0xc00, SystemCall, UnknownException)
STD_EXCEPTION(EXC_OFF_TRACE, SingleStep, UnknownException)
--
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