Adding menuetlibc back to its place in /programs/develop/libraries

This version of menuetlibc was taken from revision 4743, right before I made any changes

git-svn-id: svn://kolibrios.org@4973 a494cfbc-eb01-0410-851d-a64ba20cac60

programs/develop/libraries/menuetlibc/src/libipc/Makefile

@@ -0,0 +1,5 @@
+OUTFILE = $(MENUETDEV)/lib/libipc.a
+OBJS = hdr.o send.o recv.o
+CFLAGS = -O2 -fomit-frame-pointer
+
+include $(MENUETDEV)/makefiles/Makefile_for_lib

programs/develop/libraries/menuetlibc/src/libipc/hdr.c

@@ -0,0 +1,21 @@
+#include"ipc.h"
+#include<stdlib.h>
+
+ipc_hdr_t * create_ipc(unsigned long size)
+{
+ ipc_hdr_t * hdr=(ipc_hdr_t *)malloc(size+sizeof(ipc_hdr_t));
+ if(!hdr) return NULL;
+ hdr->lock=0;
+ hdr->free_ptr=8;
+ return hdr;
+}
+
+void register_ipc_mem(ipc_hdr_t * hdr)
+{
+ int d0,d1,d2;
+ __asm__ __volatile__(
+     "int $0x40"
+     :"=a"(d0),"=b"(d1),"=c"(d2)
+     :"0"(60),"1"(1),"2"(hdr)
+     :"memory");
+}

programs/develop/libraries/menuetlibc/src/libipc/ipc.h

@@ -0,0 +1,21 @@
+#ifndef __MENUETOS_IPC_H
+#define __MENUETOS_IPC_H
+
+typedef struct {
+    volatile unsigned long lock;
+    unsigned long free_ptr;
+    char __mem[0];
+} ipc_hdr_t;
+
+typedef struct {
+    unsigned long sender_pid;
+    unsigned long msg_length;
+    char message[0];
+} ipc_msg_t;
+
+ipc_hdr_t * create_ipc(unsigned long size);
+void register_ipc_mem(ipc_hdr_t * hdr);
+void ipc_send_message(int dst_pid,ipc_msg_t * msg);
+extern inline int ipc_messages_avail(ipc_hdr_t * hdr);
+
+#endif

programs/develop/libraries/menuetlibc/src/libipc/recv.c

@@ -0,0 +1,58 @@
+#include"ipc.h"
+#include<stdlib.h>
+#include<string.h>
+
+inline int ipc_messages_avail(ipc_hdr_t * hdr)
+{
+ return hdr->free_ptr!=8;
+}
+
+static inline void lock_msg_queue(ipc_hdr_t * hdr)
+{
+ int d0;
+ __asm__ __volatile__(
+     "2:\t"
+     "movb $1,%%al\n\t"
+     "xchgb %%al,%0\n\t"
+     "andb %%al,%%al\n\t"
+     "jnz 2b\n\t"
+     "incb %0"
+     :"=m"(hdr->lock),"=a"(d0)
+     :"m"(hdr->lock)
+     :"memory");
+}
+
+static inline void unlock_msg_queue(ipc_hdr_t * hdr)
+{
+ __asm__ __volatile__(
+     "movl $0,%0"
+     :"=m"(hdr->lock)
+     :"m"(hdr->lock)
+     :"memory");
+}
+
+ipc_msg_t * ipc_receive_msg(ipc_hdr_t * hdr)
+{
+ ipc_msg_t * msg, * tmp;
+ lock_msg_queue(hdr);
+ if(!ipc_messages_avail(hdr))
+ {
+  unlock_msg_queue(hdr);
+  return NULL;
+ }
+ tmp=(ipc_msg_t *)hdr->__mem;
+ msg=(ipc_msg_t *)malloc(tmp->msg_length);
+ if(!msg)
+ {
+  unlock_msg_queue(hdr);
+  return NULL;
+ }
+ memcpy(msg,tmp,tmp->msg_length);
+ if(hdr->free_ptr>(8+tmp->msg_length))
+ {
+  memcpy(tmp,tmp+1,hdr->free_ptr-8-tmp->msg_length);
+  hdr->free_ptr-=tmp->msg_length;
+ }
+ unlock_msg_queue(hdr);
+ return msg;
+}

programs/develop/libraries/menuetlibc/src/libipc/send.c

@@ -0,0 +1,13 @@
+#include"ipc.h"
+#include<stdlib.h>
+
+void ipc_send_message(int dst_pid,ipc_msg_t * msg)
+{
+ int d0,d1,d2,d3,d4;
+ __asm__ __volatile__(
+     "addl $4,%%edx\n\t"
+     "int $0x40"
+     :"=a"(d0),"=b"(d1),"=c"(d2),"=d"(d3),"=S"(d4)
+     :"0"(60),"1"(2),"2"(dst_pid),"3"(msg),"4"(msg->msg_length)
+     :"memory");
+}