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authorEric Biederman <ebiederm@xmission.com>2004-10-16 08:38:58 +0000
committerEric Biederman <ebiederm@xmission.com>2004-10-16 08:38:58 +0000
commitf3ed1cfad748bf5610d315afba7ec04d6338bd9b (patch)
tree53c56bca5bc651c1e4f129c49d6083033f8273bf /src/arch/i386/include
parent7003ba4a88a847707c55d593e517eaa70fc8c63d (diff)
- HDAMA boots!
- Set the bootstrap processor flag in the mptable. - Implement 64bit support in our print statements - Fix the reporting of how many cpus we are waiting to stop. It is the 1 less than the actual number of cpus running. - Actually enable cpu_initialization. - Fix firstsiblingdevice in config.g - Add IORESOURCE_FIXED to all of the resources set by config.g - Fix the apic_cluster rule to add an apic_cluster path not an apic path. - Add a div64.h to assist in the 64bit printf. git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1682 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'src/arch/i386/include')
-rw-r--r--src/arch/i386/include/div64.h48
1 files changed, 48 insertions, 0 deletions
diff --git a/src/arch/i386/include/div64.h b/src/arch/i386/include/div64.h
new file mode 100644
index 0000000000..28ed8b296a
--- /dev/null
+++ b/src/arch/i386/include/div64.h
@@ -0,0 +1,48 @@
+#ifndef __I386_DIV64
+#define __I386_DIV64
+
+/*
+ * do_div() is NOT a C function. It wants to return
+ * two values (the quotient and the remainder), but
+ * since that doesn't work very well in C, what it
+ * does is:
+ *
+ * - modifies the 64-bit dividend _in_place_
+ * - returns the 32-bit remainder
+ *
+ * This ends up being the most efficient "calling
+ * convention" on x86.
+ */
+#define do_div(n,base) ({ \
+ unsigned long __upper, __low, __high, __mod, __base; \
+ __base = (base); \
+ asm("":"=a" (__low), "=d" (__high):"A" (n)); \
+ __upper = __high; \
+ if (__high) { \
+ __upper = __high % (__base); \
+ __high = __high / (__base); \
+ } \
+ asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (__base), "0" (__low), "1" (__upper)); \
+ asm("":"=A" (n):"a" (__low),"d" (__high)); \
+ __mod; \
+})
+
+/*
+ * (long)X = ((long long)divs) / (long)div
+ * (long)rem = ((long long)divs) % (long)div
+ *
+ * Warning, this will do an exception if X overflows.
+ */
+#define div_long_long_rem(a,b,c) div_ll_X_l_rem(a,b,c)
+
+extern inline long
+div_ll_X_l_rem(long long divs, long div, long *rem)
+{
+ long dum2;
+ __asm__("divl %2":"=a"(dum2), "=d"(*rem)
+ : "rm"(div), "A"(divs));
+
+ return dum2;
+
+}
+#endif