mention globabls.asm

CONTRIBUTING.md

@@ -16,8 +16,8 @@ All functions in the standard library should follow the following outline:
 ; Arguments: <which register contains what argument>
 ; Result: <what is the result, and where is it stored>
 ; Clobbers: <list of registers that are clobbered>
-<label>: <;SHOULD BE INLINED>
-    <CODE>
+fn_label: <;SHOULD BE INLINED>
+    CODE 
 
 ```
 

MEMORY.md

@@ -0,0 +1,21 @@
+# Memory Map
+
+To not have to allocate a ton of things at run time the Standard Library uses a static memory map for some purposes
+
+## Overview
+
+| Start | Use |
+| ---- | ---- |
+| `0x0` | Reset Vector |
+| `0x16` | Zero Page |
+| `0x100` | User Code |
+| `?` | Library Code |
+| `0x1_0000` | LUTs |
+| `?` | heap |
+| `0xXXF0_0000` | Stack |
+| `0xXXFF_0000` | quick access |
+
+## Zero Page
+Some values are needed not often enough to get their own special register, but often enough that it makes sense to keep them at a quickly accessible location.
+This is what the zero page is for. its position in memory allows us to load them into a register with a single instruction.
+

README.md

@@ -4,6 +4,7 @@ This is a standard library for symphony.
 It is both intended as a practical toolkit to develop more complex software as well as a teaching resource.
 
 If you just want to use the standard library [[stdlib.asm]] is your main header, include it after your code.
+You also need to include [[globals.asm]] as the first line in your assembly file.
 
 If you are using it as a learning resource have a look at the [teaching folder](teaching).
 

globals.asm

@@ -0,0 +1,10 @@
+jmp 0x100
+
+@0x10
+screen:
+    frambuffer_ptr: U32 0x0
+    size: U32 0x0
+    position_xy: U32 0x0
+    mode: U32 0x0
+
+@0x100

imath.asm

@@ -1,15 +1,8 @@
-; Multiplies r1 and r2, returning the lower part of the result
-; Arguments:
-; r1 - The first value
-; r2 - The second value
-; Result:
-; r1 - The lower 32 bits of the result
-; Clobbers: r2, r3, r4, r5
 pub mul_low:
 	mov r3, 0 ; result
 	mov r4, 31 ; loop counter
 	
-	mul_low_loop:
+	mull_loop:
 		asr r5, r2, 31
 		and r5, r5, r1
 		lsl r5, r5, r4
@@ -17,18 +10,14 @@ pub mul_low:
 		lsl r2, r2, 1
 		sub r4, r4, 1
 		cmp r4, 0
-		jge mul_low_loop
+		jge mull_loop
 	mov r1, r3
 	
 	jmp r13
 
 ; Calculates the absolute value of the value provided in the r1 register
-; Arguments:
-; r1 - The value for which we want the absolute value
-; Result:
-; r1 - The calculated absolute value
-; Clobbers: r2
-; Info: Based on Stanford's BitHacks
+; Based on Stanford's BitHacks
+; Clobbers r2
 pub abs: ; SHOULD BE INLINED
 	; mask = v >> 31
 	asr r2, r1, 31
@@ -39,13 +28,8 @@ pub abs: ; SHOULD BE INLINED
 	jmp r13
 
 ; Calculates the minimum value of the two values provided in the r1 and r2 registers
-; Arguments:
-; r1 - The first value
-; r2 - The second value
-; Result:
-; r1 - The smaller value
-; Clobbers: Nothing
-; Info: Based on Stanford's BitHacks
+; Based on Stanford's BitHacks
+; Clobbers flags
 pub min: ; SHOULD BE INLINED
 	; x < y
 	cmp r1, r2
@@ -61,13 +45,8 @@ pub min: ; SHOULD BE INLINED
 	jmp r13
 
 ; Calculates the maximum value of the two values provided in the r1 and r2 registers
-; Arguments:
-; r1 - The first value
-; r2 - The second value
-; Result:
-; r1 - The smaller value
-; Clobbers: r2
-; Info: Based on Stanford's BitHacks
+; Based on Stanford's BitHacks
+; Clobbers r2 and flags
 pub max: ; SHOULD BE INLINED
 	; x < y
 	cmp r1, r2