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magic.mac: extract from boot.asm

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E. C. Masloch 2024-02-07 00:05:45 +01:00 committed by Kenneth J Davis
parent 4ae6f22249
commit bcf3c1701a
2 changed files with 67 additions and 63 deletions
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65
boot/boot.asm
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@ -88,70 +88,9 @@
%error Must select one FS
%endif
%macro _appenddigitstrdef 2.nolist
%substr %%ii "0123456789ABCDEF" (%2) + 1
%strcat _%1 _%1,%%ii
%endmacro
; %1 = name of single-line macro to set. will be prefixed by underscore
; %2 = number to write
; %3 = minimal number of hexits, 0..8. defaults to 1
; (setting it to 0 with a number of 0 defines macro to "")
%macro _autohexitsstrdef 2-3.nolist 1
%if %3 > 8
%error Minimal number of hexits 9 or more: %3
%endif
%define _%1 ""
%if (%2) >= 1_0000_0000h
%error Number has to use 9 or more hexits: %2
%endif
%if (%2) >= 1000_0000h || %3 >= 8
_appenddigitstrdef %1, (%2 >> (7 * 4)) & 0Fh
%endif
%if (%2) >= 100_0000h || %3 >= 7
_appenddigitstrdef %1, (%2 >> (6 * 4)) & 0Fh
%endif
%if (%2) >= 10_0000h || %3 >= 6
_appenddigitstrdef %1, (%2 >> (5 * 4)) & 0Fh
%endif
%if (%2) >= 1_0000h || %3 >= 5
_appenddigitstrdef %1, (%2 >> (4 * 4)) & 0Fh
%endif
%if (%2) >= 1000h || %3 >= 4
_appenddigitstrdef %1, (%2 >> (3 * 4)) & 0Fh
%endif
%if (%2) >= 100h || %3 >= 3
_appenddigitstrdef %1, (%2 >> (2 * 4)) & 0Fh
%endif
%if (%2) >= 10h || %3 >= 2
_appenddigitstrdef %1, (%2 >> (1 * 4)) & 0Fh
%endif
%if (%2) >= 1h || %3 >= 1
_appenddigitstrdef %1, (%2 >> (0 * 4)) & 0Fh
%endif
%endmacro
; NOTE: sys must be updated if magic offsets change
%macro magicoffset 3.nolist
%ifdef ISFAT12
%define SYSOFFSET %2
%elifdef ISFAT16
%define SYSOFFSET %3
%else
%define SYSOFFSET 0
; Just a placeholder, so the proper error message
; will be shown when assembling without either
; of the ISFATx defines.
%endif
%assign NEWOFFSET $ - Entry
%if NEWOFFSET != SYSOFFSET
_autohexitsstrdef NEWOFFSETHEX, NEWOFFSET
%strcat _NEWOFFSETHEX _NEWOFFSETHEX,'h'
%deftok NEWOFFSET _NEWOFFSETHEX
%error Magic offset %1 changed for FATFS, old=SYSOFFSET, new=NEWOFFSET
%endif
%endmacro
%assign ISFAT1216DUAL 1
%include "magic.mac"
segment .text

65
boot/magic.mac Normal file
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@ -0,0 +1,65 @@
; Public Domain 2024 by E. C. Masloch
%macro _appenddigitstrdef 2.nolist
%substr %%ii "0123456789ABCDEF" (%2) + 1
%strcat _%1 _%1,%%ii
%endmacro
; %1 = name of single-line macro to set. will be prefixed by underscore
; %2 = number to write
; %3 = minimal number of hexits, 0..8. defaults to 1
; (setting it to 0 with a number of 0 defines macro to "")
%macro _autohexitsstrdef 2-3.nolist 1
%if %3 > 8
%error Minimal number of hexits 9 or more: %3
%endif
%define _%1 ""
%if (%2) >= 1_0000_0000h
%error Number has to use 9 or more hexits: %2
%endif
%if (%2) >= 1000_0000h || %3 >= 8
_appenddigitstrdef %1, (%2 >> (7 * 4)) & 0Fh
%endif
%if (%2) >= 100_0000h || %3 >= 7
_appenddigitstrdef %1, (%2 >> (6 * 4)) & 0Fh
%endif
%if (%2) >= 10_0000h || %3 >= 6
_appenddigitstrdef %1, (%2 >> (5 * 4)) & 0Fh
%endif
%if (%2) >= 1_0000h || %3 >= 5
_appenddigitstrdef %1, (%2 >> (4 * 4)) & 0Fh
%endif
%if (%2) >= 1000h || %3 >= 4
_appenddigitstrdef %1, (%2 >> (3 * 4)) & 0Fh
%endif
%if (%2) >= 100h || %3 >= 3
_appenddigitstrdef %1, (%2 >> (2 * 4)) & 0Fh
%endif
%if (%2) >= 10h || %3 >= 2
_appenddigitstrdef %1, (%2 >> (1 * 4)) & 0Fh
%endif
%if (%2) >= 1h || %3 >= 1
_appenddigitstrdef %1, (%2 >> (0 * 4)) & 0Fh
%endif
%endmacro
%macro magicoffset 3.nolist
%ifdef ISFAT12
%define SYSOFFSET %2
%elifdef ISFAT16
%define SYSOFFSET %3
%else
%define SYSOFFSET 0
; Just a placeholder, so the proper error message
; will be shown when assembling without either
; of the ISFATx defines.
%endif
%assign NEWOFFSET $ - Entry
%if NEWOFFSET != SYSOFFSET
_autohexitsstrdef NEWOFFSETHEX, NEWOFFSET
%strcat _NEWOFFSETHEX _NEWOFFSETHEX,'h'
%deftok NEWOFFSET _NEWOFFSETHEX
%error Magic offset %1 changed for FATFS, old=SYSOFFSET, new=NEWOFFSET
%endif
%endmacro