From f013d0b7c98ef0de999741936f0d8e71b40cb122 Mon Sep 17 00:00:00 2001
From: Pavel Pisa <pisa@cmp.felk.cvut.cz>
Date: Tue, 5 May 2020 12:32:16 +0200
Subject: [PATCH] seminaries/qtmips/fb-simple: example to draw on QtMips LCD
display.
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
---
seminaries/qtmips/fb-simple/.gitignore | 4 ++
seminaries/qtmips/fb-simple/Makefile | 71 +++++++++++++++++++++++++
seminaries/qtmips/fb-simple/crt0local.S | 69 ++++++++++++++++++++++++
seminaries/qtmips/fb-simple/fb-simple.c | 53 ++++++++++++++++++
4 files changed, 197 insertions(+)
create mode 100644 seminaries/qtmips/fb-simple/.gitignore
create mode 100644 seminaries/qtmips/fb-simple/Makefile
create mode 100644 seminaries/qtmips/fb-simple/crt0local.S
create mode 100644 seminaries/qtmips/fb-simple/fb-simple.c
diff --git a/seminaries/qtmips/fb-simple/.gitignore b/seminaries/qtmips/fb-simple/.gitignore
new file mode 100644
index 0000000..4cc3a92
--- /dev/null
+++ b/seminaries/qtmips/fb-simple/.gitignore
@@ -0,0 +1,4 @@
+*.o
+fb-simple
+*~
+
diff --git a/seminaries/qtmips/fb-simple/Makefile b/seminaries/qtmips/fb-simple/Makefile
new file mode 100644
index 0000000..c54c639
--- /dev/null
+++ b/seminaries/qtmips/fb-simple/Makefile
@@ -0,0 +1,71 @@
+ARCH=mips-elf
+
+SOURCES = fb-simple.c crt0local.S
+TARGET_EXE = fb-simple
+
+CC=$(ARCH)-gcc
+CXX=$(ARCH)-g++
+AS=$(ARCH)-as
+LD=$(ARCH)-ld
+OBJCOPY=$(ARCH)-objcopy
+
+#ARCHFLAGS += -march=mips3
+ARCHFLAGS += -fno-lto
+#ARCHFLAGS += -mno-shared
+
+CFLAGS += -ggdb -O3 -Wall
+CXXFLAGS+= -ggdb -O3 -Wall
+AFLAGS += -ggdb
+LDFLAGS += -ggdb
+LDFLAGS += -nostartfiles
+LDFLAGS += -static
+
+CFLAGS += $(ARCHFLAGS)
+CXXFLAGS+= $(ARCHFLAGS)
+AFLAGS += $(ARCHFLAGS)
+LDFLAGS += $(ARCHFLAGS)
+
+OBJECTS += $(filter %.o,$(SOURCES:%.c=%.o))
+OBJECTS += $(filter %.o,$(SOURCES:%.cpp=%.o))
+OBJECTS += $(filter %.o,$(SOURCES:%.S=%.o))
+
+all : default
+
+.PHONY : default clean dep all
+
+%.o:%.S
+ $(CC) -D__ASSEMBLY__ $(AFLAGS) -c $< -o $@
+
+%.o:%.c
+ $(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@
+
+%.o:%.cpp
+ $(CXX) $(CXXFLAGS) $(CPPFLAGS) -c $<
+
+%.s:%.c
+ $(CC) $(CFLAGS) $(CPPFLAGS) -S $< -o $@
+
+default : $(TARGET_EXE)
+
+$(TARGET_EXE) : $(OBJECTS)
+ $(CC) $(LDFLAGS) $^ -o $@
+
+dep: depend
+
+depend: $(SOURCES) *.h
+ echo '# autogenerated dependencies' > depend
+ifneq ($(filter %.c,$(SOURCES)),)
+ $(CC) $(CFLAGS) $(CPPFLAGS) -w -E -M $(filter %.c,$(SOURCES)) \
+ >> depend
+endif
+ifneq ($(filter %.cpp,$(SOURCES)),)
+ $(CXX) $(CXXFLAGS) $(CPPFLAGS) -w -E -M $(filter %.cpp,$(SOURCES)) \
+ >> depend
+endif
+
+clean:
+ rm -f *.o *.a $(OBJECTS) $(TARGET_EXE) depend
+
+#mips-elf-objdump --source -M no-aliases,reg-names=numeric exam1-asm
+
+-include depend
diff --git a/seminaries/qtmips/fb-simple/crt0local.S b/seminaries/qtmips/fb-simple/crt0local.S
new file mode 100644
index 0000000..0565712
--- /dev/null
+++ b/seminaries/qtmips/fb-simple/crt0local.S
@@ -0,0 +1,69 @@
+/* minimal replacement of crt0.o provided by C library */
+
+#define zero $0
+#define AT $1
+#define v0 $2
+#define v1 $3
+#define a0 $4
+#define a1 $5
+#define a2 $6
+#define a3 $7
+
+#define t0 $8
+#define t1 $9
+#define t2 $10
+#define t3 $11
+#define t4 $12
+#define t5 $13
+#define t6 $14
+#define t7 $15
+#define t8 $24
+#define t9 $25
+#define k0 $26
+#define k1 $27
+
+#define s0 $16
+#define s1 $17
+#define s2 $18
+#define s3 $19
+#define s4 $20
+#define s5 $21
+#define s6 $22
+#define s7 $23
+
+#define gp $28
+#define sp $29
+#define fp $30
+#define ra $31
+
+.globl main
+.globl __start
+.globl _start
+.set noat
+.set noreorder
+.ent __start
+
+.text
+
+__start:
+_start:
+ bal next
+ nop
+next: .set noreorder
+ .cpload $31
+ .set reorder
+
+ addi a0, zero, 0
+ addi a1, zero, 0
+ jal main
+quit:
+ addi a0, zero, 0
+ addi v0, zero, 4001 /* SYS_exit */
+
+ syscall
+
+loop: break
+ beq zero, zero, loop
+ nop
+
+.end __start
diff --git a/seminaries/qtmips/fb-simple/fb-simple.c b/seminaries/qtmips/fb-simple/fb-simple.c
new file mode 100644
index 0000000..02c0ee0
--- /dev/null
+++ b/seminaries/qtmips/fb-simple/fb-simple.c
@@ -0,0 +1,53 @@
+#include <stdio.h>
+#include <stdint.h>
+
+int main(void)
+{
+
+ volatile uint16_t *fb = (volatile uint16_t *)0xffe00000;
+ int x, y, i;
+ int width = 480;
+ int height = 320;
+
+ for (i = 0; i < width; i++) {
+ x = i;
+ y = 0;
+ fb[y * width + x] = 0xf800;
+ y = height - 1;
+ fb[y * width + x] = 0xf800;
+ }
+
+ for (i = 1; i < height -1; i++) {
+ x = 0;
+ y = i;
+ fb[y * width + x] = 0xf800;
+ x = width - 1;
+ fb[y * width + x] = 0xf800;
+ }
+
+
+ while (1) {
+ for (y = 1; y < height - 1; y++) {
+ for (i = 0; i < 200; i++) {
+ x = (y & 0xff) + i;
+ fb[y * width + x] = 0xffff;
+ }
+ for (i = 0; i < 10; i++) {
+ x = (y & 0xff) + i + 200;
+ fb[y * width + x] = 0xf800;
+ }
+ for (i = 0; i < 10; i++) {
+ x = (y & 0xff) + i + 210;
+ fb[y * width + x] = 0x07e0;
+ }
+ for (i = 0; i < 10; i++) {
+ x = (y & 0xff) + i + 220;
+ fb[y * width + x] = 0x001f;
+ }
+ }
+ // no reorder or combine memory accesses over this sequesntial point
+ //__asm__ __volatile__ ("" : : : "memory");
+ __asm__ __volatile__ ("break\n" : : : "memory");
+ }
+ return 0;
+}
--
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