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added first CPU specific optimizations

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FeralChild64 committed 2019-09-24 17:24:32 +02:00
1 parent 5b2c28b281
commit 55e2512fe2
12 files changed
+198 -7
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c64/,,config_generic.s
+5
View File
@@ -4,6 +4,10 @@
//
#define CONFIG_CPU_MOS_6502
// #define CONFIG_CPU_WDC_65C02
// #define CONFIG_CPU_WDC_65816
#define CONFIG_MEMORY_MODEL_38K
// #define CONFIG_MEMORY_MODEL_60K
@@ -17,3 +21,4 @@
// #define CONFIG_SID_D5XX
#define CONFIG_DOS_WEDGE
#define CONFIG_BCD_SAFE_INTERRUPTS
c64/,,config_mega65.s
+5
View File
@@ -4,6 +4,10 @@
//
#define CONFIG_CPU_MOS_6502
// #define CONFIG_CPU_WDC_65C02
// #define CONFIG_CPU_WDC_65816
// #define CONFIG_MEMORY_MODEL_38K
#define CONFIG_MEMORY_MODEL_60K
@@ -17,3 +21,4 @@
// #define CONFIG_SID_D5XX
#define CONFIG_DOS_WEDGE
#define CONFIG_BCD_SAFE_INTERRUPTS
c64/,,config_ultimate64.s
+5
View File
@@ -4,6 +4,10 @@
//
#define CONFIG_CPU_MOS_6502
// #define CONFIG_CPU_WDC_65C02
// #define CONFIG_CPU_WDC_65816
#define CONFIG_MEMORY_MODEL_38K
// #define CONFIG_MEMORY_MODEL_60K
@@ -17,3 +21,4 @@
#define CONFIG_SID_D5XX
#define CONFIG_DOS_WEDGE
#define CONFIG_BCD_SAFE_INTERRUPTS
c64/aliases/,aliases_config.s
+61
View File
@@ -0,0 +1,61 @@
// Various configuration dependent aliases/macros/checks
// Check that memory model configuration is correct
{
.var selected = 0;
#if CONFIG_MEMORY_MODEL_38K
.eval selected++
#endif
#if CONFIG_MEMORY_MODEL_60K
.eval selected++
#endif
.if (selected != 1) .error "Please select exactly one CONFIG_MEMORY_MODEL_* option"
}
// Check that processor configuration is correct
{
.var selected = 0;
#if CONFIG_CPU_MOS_6502
.eval selected++
#endif
#if CONFIG_CPU_WDC_65C02
.eval selected++
#endif
#if CONFIG_CPU_WDC_65816
.eval selected++
#endif
.if (selected != 1) .error "Please select exactly one CONFIG_CPU_* option"
}
// Handle processor configuration
#if CONFIG_CPU_WDC_65C02 || CONFIG_CPU_WDC_65816
#define HAS_BCD_SAFE_INTERRUPTS
#define HAS_BCD_SAFE_RESET
.pseudocommand phx { .byte $DA }
.pseudocommand phy { .byte $5A }
.pseudocommand plx { .byte $FA }
.pseudocommand ply { .byte $7A }
#endif
// Handle misc configuration entrues
#if CONFIG_BCD_SAFE_INTERRUPTS
#define HAS_BCD_SAFE_INTERRUPTS
#endif
c64/basic/printf.s
+29 -1
View File
@@ -139,7 +139,13 @@ printf_retreat:
rts
printf_printhexbyte:
// Print the hex value in .A as two digits, idea by Haubitze
// Print the hex value in .A as two digits
#if HAS_BCD_SAFE_INTERRUPTS
// Idea by Haubitze
sed
pha
lsr
@@ -155,3 +161,25 @@ printf_printhexbyte:
adc #$30
cld
jmp JCHROUT
#else
pha
lsr
lsr
lsr
lsr
ora #$30
cmp #$3A
bcc !+
adc #6
!: jsr JCHROUT
pla
and #$0f
ora #$30
cmp #$3A
bcc !+
adc #6
!: jmp JCHROUT
#endif
c64/kernal/interrupts/ea81.return_from_interrupt.s
+6
View File
@@ -11,10 +11,16 @@ return_from_interrupt:
// Restore registers and return
// Sequence according to Compute's Mapping the 64 p73
#if CONFIG_CPU_MOS_6502
pla
tay
pla
tax
#else
ply
plx
#endif
pla
rti
c64/kernal/interrupts/fe47.default_nmi_handler.s
+5
View File
@@ -6,10 +6,15 @@ default_nmi_handler:
// Save registers, sequence according to Compute's Mapping the Commodore 64, page 73
pha
#if CONFIG_CPU_MOS_6502
txa
pha
tya
pha
#else
phx
phy
#endif
// XXX: RS-232 support is not implemented
c64/kernal/interrupts/irq_handler.s
+8 -1
View File
@@ -10,12 +10,19 @@ irq_handler:
// Save registers, sequence according to Compute's Mapping the Commodore 64, page 73
pha
#if CONFIG_CPU_MOS_6502
txa
pha
tya
pha
#else
phx
phy
#endif
cld // clear decimal flag, to prevent possible problems
#if CONFIG_CPU_MOS_6502 && CONFIG_BCD_SAFE_INTERRUPTS
cld // clear decimal flag to allow using it without disabling interrupts
#endif
// Check if caused by BRK
tsx
c64/kernal/interrupts/nmi_handler.s
+4 -1
View File
@@ -2,7 +2,10 @@
nmi_handler:
sei // don't allow IRQ to interfere, see https://www.c64-wiki.com/wiki/Interrupt
cld // clear decimal flag, to prevent possible problems
#if CONFIG_CPU_MOS_6502 && CONFIG_BCD_SAFE_INTERRUPTS
cld // clear decimal flag to allow using it without disabling interrupts
#endif
// Call interrupt routine (only if initialised)
pha
c64/kernal/printf.s
+29 -1
View File
@@ -139,7 +139,13 @@ printf_retreat:
rts
printf_printhexbyte:
// Print the hex value in .A as two digits, idea by Haubitze
// Print the hex value in .A as two digits
#if HAS_BCD_SAFE_INTERRUPTS
// Idea by Haubitze
sed
pha
lsr
@@ -155,3 +161,25 @@ printf_printhexbyte:
adc #$30
cld
jmp JCHROUT
#else
pha
lsr
lsr
lsr
lsr
ora #$30
cmp #$3A
bcc !+
adc #6
!: jsr JCHROUT
pla
and #$0f
ora #$30
cmp #$3A
bcc !+
adc #6
!: jmp JCHROUT
#endif
c64/kernal/reset_entry.s
+4 -3
View File
@@ -5,9 +5,10 @@
reset_entry:
// The GPL program at https://github.com/Klaus2m5/6502_65C02_functional_tests/blob/master/6502_functional_test.a65
// uses the following initial reset sequence
// affirmed by c64 PRG p269
cld
// uses the following initial reset sequence, affirmed by c64 PRG p269
#if !HAS_BCD_SAFE_RESET
cld // for CPUs having undefined D flag after reset
#endif
ldx #$FF
txs
sei