Merge branch '13-initialize-paging' into 'master'
Resolve "Initialize Paging" Closes #13 See merge request bslathi19/super6502!50
This commit is contained in:
Byron Lathi
@@ -96,6 +96,8 @@ full sim:
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- make clean
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- TEST_PROGRAM=$REPO_TOP/sw/bios/bios.hex TEST_FOLDER=$REPO_TOP/sw/bios make full_sim
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needs:
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- job: build toolchain
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artifacts: true
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- job: build bios
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artifacts: true
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- job: build kernel
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@@ -1,66 +1,66 @@
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@@ -137,12 +137,12 @@
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<mxGeometry relative="1" as="geometry">
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@@ -150,12 +150,12 @@
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<mxCell id="NXSZnqqENL-7S4XXd65T-82" value="we[1:0]" style="edgeLabel;html=1;align=center;verticalAlign=middle;resizable=0;points=[];" parent="NXSZnqqENL-7S4XXd65T-56" vertex="1" connectable="0">
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<mxCell id="NXSZnqqENL-7S4XXd65T-57" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=1;exitY=0.75;exitDx=0;exitDy=0;entryX=0;entryY=0.5;entryDx=0;entryDy=0;" parent="1" source="NXSZnqqENL-7S4XXd65T-49" target="NXSZnqqENL-7S4XXd65T-4" edge="1">
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<mxGeometry relative="1" as="geometry">
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<Array as="points">
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@@ -163,61 +163,61 @@
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</Array>
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</mxCell>
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<mxGeometry relative="1" as="geometry">
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<Array as="points">
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@@ -225,31 +225,31 @@
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<mxCell id="NXSZnqqENL-7S4XXd65T-67" value="ADDR[4:0]" style="edgeLabel;html=1;align=center;verticalAlign=middle;resizable=0;points=[];labelBackgroundColor=none;" parent="NXSZnqqENL-7S4XXd65T-65" vertex="1" connectable="0">
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<mxCell id="NXSZnqqENL-7S4XXd65T-69" value="WORD MUX" style="text;html=1;strokeColor=none;fillColor=none;align=center;verticalAlign=middle;whiteSpace=wrap;rounded=0;" vertex="1" parent="1">
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<mxCell id="NXSZnqqENL-7S4XXd65T-69" value="WORD MUX" style="text;html=1;strokeColor=none;fillColor=none;align=center;verticalAlign=middle;whiteSpace=wrap;rounded=0;" parent="1" vertex="1">
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<mxCell id="NXSZnqqENL-7S4XXd65T-70" value="BYTE MUX" style="text;html=1;strokeColor=none;fillColor=none;align=center;verticalAlign=middle;whiteSpace=wrap;rounded=0;" vertex="1" parent="1">
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<mxCell id="NXSZnqqENL-7S4XXd65T-70" value="BYTE MUX" style="text;html=1;strokeColor=none;fillColor=none;align=center;verticalAlign=middle;whiteSpace=wrap;rounded=0;" parent="1" vertex="1">
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<mxCell id="NXSZnqqENL-7S4XXd65T-74" value="" style="shape=flexArrow;endArrow=classic;html=1;rounded=0;entryX=0.75;entryY=0;entryDx=0;entryDy=0;fillColor=default;" parent="1" target="NXSZnqqENL-7S4XXd65T-1" edge="1">
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@@ -259,32 +259,32 @@
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|
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BIN
doc/memory_mapper/memory_mapper.drawio.png
Normal file
BIN
doc/memory_mapper/memory_mapper.drawio.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 122 KiB |
70
doc/memory_mapper/memory_mapper.md
Normal file
70
doc/memory_mapper/memory_mapper.md
Normal file
@@ -0,0 +1,70 @@
|
||||
# Memory Mapper
|
||||
|
||||
## Overview
|
||||
|
||||
The memory mapper gives expands the CPU's address space from 16 bits to 25.
|
||||
It can be expanded to be 28 bits, but only 25 are needed to access all of
|
||||
sdram.
|
||||
|
||||
Its architecture is show below:
|
||||
|
||||
|
||||
|
||||
There are 32 16 bit registers: One for each 4k page in the virtual address
|
||||
space. The memory mapper is always enabled, but at reset it is identity
|
||||
mapped, i.e. register _n_ will be reset to value _n_.
|
||||
|
||||
## Interface
|
||||
|
||||
The Memory mapper is composed of 32 identical 16 bit mapping registers
|
||||
|
||||
The chip select should be calculated based on the virtual address. If not,
|
||||
it will be possible for the CPU to map away access to the mapper, at which
|
||||
point it is impossible to change the mappings without a reset.
|
||||
|
||||
## Registers
|
||||
|
||||
### Register Map
|
||||
|
||||
| Address | Read | Write |
|
||||
|--------- |-------------- |-------------- |
|
||||
| 00 | MM0 Low | MM0 Low |
|
||||
| 01 | MM0 High | MM0 High |
|
||||
| 02 | MM1 Low | MM1 Low |
|
||||
| 03 | MM1 High | MM1 High |
|
||||
| 04 | MM2 Low | MM2 Low |
|
||||
| 05 | MM2 High | MM2 High |
|
||||
| 06 | MM3 Low | MM3 Low |
|
||||
| 07 | MM3 High | MM3 High |
|
||||
| 08 | MM4 Low | MM4 Low |
|
||||
| 09 | MM4 High | MM4 High |
|
||||
| 0A | MM5 Low | MM5 Low |
|
||||
| 0B | MM5 High | MM5 High |
|
||||
| 0C | MM6 Low | MM6 Low |
|
||||
| 0D | MM6 High | MM6 High |
|
||||
| 0E | MM7 Low | MM7 Low |
|
||||
| 0F | MM7 High | MM7 High |
|
||||
| 10 | MM8 Low | MM8 Low |
|
||||
| 11 | MM8 High | MM8 High |
|
||||
| 12 | MM9 Low | MM9 Low |
|
||||
| 13 | MM9 High | MM9 High |
|
||||
| 14 | MM10 Low | MM10 Low |
|
||||
| 15 | MM10 High | MM10 High |
|
||||
| 16 | MM11 Low | MM11 Low |
|
||||
| 17 | MM11 High | MM11 High |
|
||||
| 18 | MM12 Low | MM12 Low |
|
||||
| 19 | MM12 High | MM12 High |
|
||||
| 1A | MM13 Low | MM13 Low |
|
||||
| 1B | MM13 High | MM13 High |
|
||||
| 1C | MM14 Low | MM14 Low |
|
||||
| 1D | MM14 High | MM14 High |
|
||||
| 1E | MM15 Low | MM15 Low |
|
||||
| 1F | MM15 High | MM15 High |
|
||||
|
||||
### MMn Low
|
||||
|
||||
Low memory map data. Becomes bits [19:12] of physical address.
|
||||
|
||||
### MMn High
|
||||
|
||||
High memory map data. Becomes bits [27:20] of physical address.
|
||||
2
hw/efinix_fpga/.gitignore
vendored
2
hw/efinix_fpga/.gitignore
vendored
@@ -7,4 +7,4 @@ outflow
|
||||
*.gtkw
|
||||
*.vvp
|
||||
|
||||
.mem
|
||||
*.mem
|
||||
10
sw/kernel/devices/mapper.h
Normal file
10
sw/kernel/devices/mapper.h
Normal file
@@ -0,0 +1,10 @@
|
||||
#ifndef _MAPPER_H
|
||||
#define _MAPPER_H
|
||||
|
||||
#include <stdint.h>
|
||||
|
||||
void init_mapper();
|
||||
|
||||
void map(uint16_t p_page, uint8_t v_page);
|
||||
|
||||
#endif
|
||||
38
sw/kernel/devices/mapper.s
Normal file
38
sw/kernel/devices/mapper.s
Normal file
@@ -0,0 +1,38 @@
|
||||
.MACPACK generic
|
||||
|
||||
.autoimport
|
||||
|
||||
.export _init_mapper
|
||||
.export _map
|
||||
|
||||
MAPPER_BASE = $200
|
||||
|
||||
.code
|
||||
|
||||
; void init_paging();
|
||||
; This should be identity mapped at reset, but we can do it again anyway
|
||||
.proc _init_mapper
|
||||
ldx #$00
|
||||
L1:
|
||||
txa
|
||||
lsr
|
||||
sta MAPPER_BASE,x
|
||||
lda #$00
|
||||
sta MAPPER_BASE+1,x
|
||||
inx
|
||||
inx
|
||||
cpx #$20
|
||||
blt L1
|
||||
rts
|
||||
.endproc
|
||||
|
||||
; void map(uint16_t p_page, uint8_t v_page);
|
||||
.proc _map
|
||||
asl
|
||||
tax ; x = v_page * 2
|
||||
jsr popa ; low byte of p_page
|
||||
sta MAPPER_BASE,x ; write low byte to mm_low
|
||||
jsr popa ; high byte of p_page
|
||||
sta MAPPER_BASE+1,x ; write high byte to mm_high
|
||||
rts
|
||||
.endproc
|
||||
@@ -15,13 +15,13 @@ RTC_OUTPUT = $30
|
||||
RTC_CONTROL = $30
|
||||
|
||||
THRESHOLD_0 = $a0
|
||||
; THRESHOLD_1 = $0f
|
||||
THRESHOLD_1 = $00
|
||||
THRESHOLD_1 = $0f
|
||||
; THRESHOLD_1 = $00
|
||||
THRESHOLD_2 = $00
|
||||
THRESHOLD_3 = $00
|
||||
|
||||
; IRQ_THRESHOLD_0 = $32
|
||||
IRQ_THRESHOLD_0 = $10
|
||||
IRQ_THRESHOLD_0 = $32
|
||||
; IRQ_THRESHOLD_0 = $10
|
||||
IRQ_THRESHOLD_1 = $00
|
||||
IRQ_THRESHOLD_2 = $00
|
||||
IRQ_THRESHOLD_3 = $00
|
||||
|
||||
@@ -6,6 +6,8 @@
|
||||
#define BUTTON (1 << 0)
|
||||
#define UART (1 << 1)
|
||||
|
||||
void init_interrupts();
|
||||
|
||||
void register_irq(void* addr, uint8_t irqn);
|
||||
|
||||
uint8_t irq_get_status();
|
||||
|
||||
@@ -3,15 +3,38 @@
|
||||
.autoimport
|
||||
|
||||
.import _enable_irq
|
||||
.import _map
|
||||
|
||||
.export irq_int, nmi_int
|
||||
.export _register_irq
|
||||
.export _init_interrupts
|
||||
|
||||
IRQ_CMD_ADDR = $effc
|
||||
IRQ_DAT_ADDR = $effd
|
||||
|
||||
IRQ_CMD_READIRQ = $00
|
||||
|
||||
; void init_interrupts();
|
||||
; remap the upper page into ram,
|
||||
; then load the new vector addresses.
|
||||
.proc _init_interrupts
|
||||
; map(001f, f);
|
||||
lda #$1f
|
||||
jsr pushax
|
||||
lda #$f
|
||||
jsr _map
|
||||
|
||||
lda #<irq_int
|
||||
sta $fffe
|
||||
lda #>irq_int
|
||||
sta $ffff
|
||||
|
||||
lda #<nmi_int
|
||||
sta $fffa
|
||||
lda #>nmi_int
|
||||
sta $fffb
|
||||
rts
|
||||
.endproc
|
||||
|
||||
.proc nmi_int
|
||||
rti
|
||||
|
||||
@@ -1,11 +1,14 @@
|
||||
#include <conio.h>
|
||||
#include "devices/interrupt_controller.h"
|
||||
#include "interrupts/interrupt.h"
|
||||
#include "devices/mapper.h"
|
||||
#include "devices/rtc.h"
|
||||
|
||||
|
||||
void handle_rtc_interrupt() {
|
||||
cputs("In IRQ interrupt!\n");
|
||||
// cputs("In IRQ interrupt!\n");
|
||||
cputc('A');
|
||||
send_eoi();
|
||||
asm volatile ("rti");
|
||||
}
|
||||
|
||||
@@ -13,11 +16,11 @@ int main() {
|
||||
|
||||
cputs("Kernel\n");
|
||||
|
||||
// cputs("Init Paging\n")
|
||||
// init_paging()
|
||||
cputs("Init Mapper\n");
|
||||
init_mapper();
|
||||
|
||||
// cputs("Initialize Interrupts\n");
|
||||
// init_interrupts();
|
||||
cputs("Initialize Interrupts\n");
|
||||
init_interrupts();
|
||||
|
||||
cputs("Initialize Interrupt Controller\n");
|
||||
init_interrupt_controller();
|
||||
|
||||
Reference in New Issue
Block a user