Comments update

1 files changed, 21 insertions, 2 deletions

diff --git a/rs422lib/sysctl.h b/rs422lib/sysctl.h
index 11b65ed..b8301fa 100644
--- a/rs422lib/sysctl.h
+++ b/rs422lib/sysctl.h
@@ -12,6 +12,8 @@
 #ifndef SYSCTL_H_

 #define SYSCTL_H_

 

+// Sysctl priority bit

+// Lowest first

 #define SYS_BIT7 (0x80)

 #define SYS_BIT6 (0x40)

 #define SYS_BIT5 (0x20)

@@ -20,17 +22,34 @@
 #define SYS_BIT2 (0x04)

 #define SYS_BIT1 (0x02)

 #define SYS_BIT0 (0x01)

+

+// SYSCALL invocation routine

+// Used this in IRQ, also wakes up the cpu

 #define SYSCALL_IRQ(X) (syscall|=X,_BIC_SR_IRQ(CPUOFF))

+// Use this in anywhere other than IRQ

+// Continuous invocation ?

 #define SYSCALL(X) (syscall|=X)

 

+// Call handler type

+// Does't have any input

+// 	Preserve the state in other global variables

+//	Usage example -> rsbus_syscall()

 typedef void (*syshdlr)();

 

-void sysctl_reghdlr(unsigned int bit,syshdlr rot);// Always replace

+// Register call handler

+// Always replace old value

+void sysctl_reghdlr(unsigned int bit,syshdlr rot);

 

-void sysctl_rmhdlr(unsigned int bit);// Replace with something useless

+// Remove old call handler

+// Replace with something useless

+void sysctl_rmhdlr(unsigned int bit);

 

+// Insert it into mainloop

+// enabling automatic procedure invocation

 void sysroutine();

 

+// Setting up the proc base

+// Call before usage

 void sysctl_init();

 

 extern volatile unsigned char syscall;