From e5888a1ffdae813d7575f5fb02275c6bb07e5199 Mon Sep 17 00:00:00 2001
From: Taru Karttunen <taruti@taruti.net>
Date: Wed, 30 Mar 2011 15:46:40 +0300
Subject: Import sources from 2011-03-30 iso image

---
 sys/src/cmd/unix/drawterm/kern/allocb.c | 165 ++++++++++++++++++++++++++++++++
 1 file changed, 165 insertions(+)
 create mode 100755 sys/src/cmd/unix/drawterm/kern/allocb.c

(limited to 'sys/src/cmd/unix/drawterm/kern/allocb.c')

diff --git a/sys/src/cmd/unix/drawterm/kern/allocb.c b/sys/src/cmd/unix/drawterm/kern/allocb.c
new file mode 100755
index 000000000..ab1595c89
--- /dev/null
+++ b/sys/src/cmd/unix/drawterm/kern/allocb.c
@@ -0,0 +1,165 @@
+#include	"u.h"
+#include	"lib.h"
+#include	"dat.h"
+#include	"fns.h"
+#include	"error.h"
+
+enum
+{
+	Hdrspc		= 64,		/* leave room for high-level headers */
+	Bdead		= 0x51494F42,	/* "QIOB" */
+};
+
+struct
+{
+	Lock	lk;
+	ulong	bytes;
+} ialloc;
+
+static Block*
+_allocb(int size)
+{
+	Block *b;
+	uintptr addr;
+
+	if((b = mallocz(sizeof(Block)+size+Hdrspc, 0)) == nil)
+		return nil;
+
+	b->next = nil;
+	b->list = nil;
+	b->free = 0;
+	b->flag = 0;
+
+	/* align start of data portion by rounding up */
+	addr = (uintptr)b;
+	addr = ROUND(addr + sizeof(Block), BLOCKALIGN);
+	b->base = (uchar*)addr;
+
+	/* align end of data portion by rounding down */
+	b->lim = ((uchar*)b) + sizeof(Block)+size+Hdrspc;
+	addr = (uintptr)(b->lim);
+	addr = addr & ~(BLOCKALIGN-1);
+	b->lim = (uchar*)addr;
+
+	/* leave sluff at beginning for added headers */
+	b->rp = b->lim - ROUND(size, BLOCKALIGN);
+	if(b->rp < b->base)
+		panic("_allocb");
+	b->wp = b->rp;
+
+	return b;
+}
+
+Block*
+allocb(int size)
+{
+	Block *b;
+
+	/*
+	 * Check in a process and wait until successful.
+	 * Can still error out of here, though.
+	 */
+	if(up == nil)
+		panic("allocb without up: %p\n", getcallerpc(&size));
+	if((b = _allocb(size)) == nil){
+		panic("allocb: no memory for %d bytes\n", size);
+	}
+	setmalloctag(b, getcallerpc(&size));
+
+	return b;
+}
+
+Block*
+iallocb(int size)
+{
+	Block *b;
+	static int m1, m2;
+
+	if(ialloc.bytes > conf.ialloc){
+		if((m1++%10000)==0)
+			print("iallocb: limited %lud/%lud\n",
+				ialloc.bytes, conf.ialloc);
+		return 0;
+	}
+
+	if((b = _allocb(size)) == nil){
+		if((m2++%10000)==0)
+			print("iallocb: no memory %lud/%lud\n",
+				ialloc.bytes, conf.ialloc);
+		return nil;
+	}
+	setmalloctag(b, getcallerpc(&size));
+	b->flag = BINTR;
+
+	ilock(&ialloc.lk);
+	ialloc.bytes += b->lim - b->base;
+	iunlock(&ialloc.lk);
+
+	return b;
+}
+
+void
+freeb(Block *b)
+{
+	void *dead = (void*)Bdead;
+
+	if(b == nil)
+		return;
+
+	/*
+	 * drivers which perform non cache coherent DMA manage their own buffer
+	 * pool of uncached buffers and provide their own free routine.
+	 */
+	if(b->free) {
+		b->free(b);
+		return;
+	}
+	if(b->flag & BINTR) {
+		ilock(&ialloc.lk);
+		ialloc.bytes -= b->lim - b->base;
+		iunlock(&ialloc.lk);
+	}
+
+	/* poison the block in case someone is still holding onto it */
+	b->next = dead;
+	b->rp = dead;
+	b->wp = dead;
+	b->lim = dead;
+	b->base = dead;
+
+	free(b);
+}
+
+void
+checkb(Block *b, char *msg)
+{
+	void *dead = (void*)Bdead;
+
+	if(b == dead)
+		panic("checkb b %s %lux", msg, b);
+	if(b->base == dead || b->lim == dead || b->next == dead
+	  || b->rp == dead || b->wp == dead){
+		print("checkb: base 0x%8.8luX lim 0x%8.8luX next 0x%8.8luX\n",
+			b->base, b->lim, b->next);
+		print("checkb: rp 0x%8.8luX wp 0x%8.8luX\n", b->rp, b->wp);
+		panic("checkb dead: %s\n", msg);
+	}
+
+	if(b->base > b->lim)
+		panic("checkb 0 %s %lux %lux", msg, b->base, b->lim);
+	if(b->rp < b->base)
+		panic("checkb 1 %s %lux %lux", msg, b->base, b->rp);
+	if(b->wp < b->base)
+		panic("checkb 2 %s %lux %lux", msg, b->base, b->wp);
+	if(b->rp > b->lim)
+		panic("checkb 3 %s %lux %lux", msg, b->rp, b->lim);
+	if(b->wp > b->lim)
+		panic("checkb 4 %s %lux %lux", msg, b->wp, b->lim);
+
+}
+
+void
+iallocsummary(void)
+{
+	print("ialloc %lud/%lud\n", ialloc.bytes, conf.ialloc);
+}
-- 
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