added simple syscall interface

1 files changed, 36 insertions, 0 deletions

diff --git a/kernel/shell.c b/kernel/shell.c
index b377ce0..2e00bd0 100644
--- a/kernel/shell.c
+++ b/kernel/shell.c
@@ -82,6 +82,42 @@ void shell_execute()
     {
 //	uint8_t *read= flpydsk_read_sector (10);
     }
+    else if(1==strcmp(command,"SYSCALL",0))
+    {
+
+	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"system call 10");
+	uint32_t ebx; // will hold return value;
+	// system call 
+	asm("pusha");
+	asm("mov $10,%eax"); // select syscall 10 (example_syscall)
+	asm("mov $666,%edx");
+	asm("mov $333,%ecx");
+	asm("int $0x80"); // actual syscall ! interrupt
+        asm("mov %%ebx, %0": "=b" (ebx));
+	asm("popa");
+	//
+
+	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"system call returned %d",ebx);
+
+    }
+    else if(1==strcmp(command,"TWO",0))
+    {
+
+	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"system call 20");
+	uint32_t ebx; // will hold return value;
+	// system call 
+	asm("pusha");
+	asm("mov $20,%eax"); // select syscall2 20 (example_syscall)
+	asm("mov $566,%edx");
+	asm("mov $233,%ecx");
+	asm("int $0x80"); // actual syscall ! interrupt
+        asm("mov %%ebx, %0": "=b" (ebx));
+	asm("popa");
+	//
+
+	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"system call returned %d",ebx);
+
+    }
     else
     {
 	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"command unknown");