PowLu/TencentOS-tiny
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

add cortex-v7a support

Browse Source 
How To Run:
    see TencentOS-tiny\board\ALPHA_I.MX_emmc_256ddr\README.md

TODO Next:
1. VFP support
2. fault diagnosis support
3. qemu vexpress ca9 support
4. raspberry pi support
5. SMP support
This commit is contained in:
daishengdong
2020-01-19 19:06:24 +08:00
parent 08ab1d88e1
commit 3d9d6198c8
115 changed files with 98070 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

52
board/ALPHA_I.MX_emmc_256ddr/stdio/lib/div64.c Normal file
View File

@@ -0,0 +1,52 @@
/*
* Copyright (C) 2003 Bernardo Innocenti <bernie@develer.com>
*
* Based on former do_div() implementation from asm-parisc/div64.h:
* Copyright (C) 1999 Hewlett-Packard Co
* Copyright (C) 1999 David Mosberger-Tang <davidm@hpl.hp.com>
*
*
* Generic C version of 64bit/32bit division and modulo, with
* 64bit result and 32bit remainder.
*
* The fast case for (n>>32 == 0) is handled inline by do_div().
*
* Code generated for this function might be very inefficient
* for some CPUs. __div64_32() can be overridden by linking arch-specific
* assembly versions such as arch/powerpc/lib/div64.S and arch/sh/lib/div64.S.
*/
#include "div64.h"
unsigned int __div64_32(unsigned long long *n, unsigned int base)
{
unsigned long long rem = *n;
unsigned long long b = base;
unsigned long long res, d = 1;
unsigned int high = rem >> 32;
/* Reduce the thing a bit first */
res = 0;
if (high >= base) {
high /= base;
res = (unsigned long long ) high << 32;
rem -= (unsigned long long ) (high*base) << 32;
}
while ((signed long long )b > 0 && b < rem) {
b = b+b;
d = d+d;
}
do {
if (rem >= b) {
rem -= b;
res += d;
}
b >>= 1;
d >>= 1;
} while (d);
*n = res;
return rem;
}