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| author | Kartik K. Agaram <vc@akkartik.com> | 2021-08-29 20:34:53 -0700 |
|---|---|---|
| committer | Kartik K. Agaram <vc@akkartik.com> | 2021-08-29 20:34:53 -0700 |
| commit | b1dcfb03d00f93999da0225600fe5f9d708e439c (patch) | |
| tree | f4f3978f93918d4551dd7e13b2f97f57f8b83db9 /boot.subx | |
| parent | 354c72a6377d04574efe1c5cfb4b29d91c939b15 (diff) | |
| download | mu-b1dcfb03d00f93999da0225600fe5f9d708e439c.tar.gz | |
load Font in a non-contiguous area of memory
Diffstat (limited to 'boot.subx')
| -rw-r--r-- | boot.subx | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/boot.subx b/boot.subx index 1cd78bfd..ed1631bc 100644 --- a/boot.subx +++ b/boot.subx @@ -16,6 +16,7 @@ # Memory map of a Mu computer: # code: [0x00007c00, 0x0007de00) +# system font: [0x00100000, 0x00f00000) # stack: (0x02000000, 0x01000000] # heap: [0x02000000, 0x80000000) # see 120allocate.subx; Qemu initializes with 128MB RAM by default; simulating 2GB RAM is known to work @@ -275,6 +276,13 @@ initialize_32bit_mode: bc/copy-to-esp 0x02000000/imm32 + ## install the font somewhere non-contiguous (keep sync'd with memory map up top) + c7 0/subop/copy *0x00100000 0/imm32/read + c7 0/subop/copy *0x00100004 0/imm32/write + c7 0/subop/copy *0x00100008 0x00e00000/imm32/size + (load-sectors Primary-bus-primary-drive 0x2328 0x120 0x00100000) # source 0x2328 = sector 9000 on disk, destination 0x00100000 + # Font is now loaded starting at 0x0010000c. + ## load interrupt handlers # We can't refer to the label directly because SubX doesn't do the right # thing for lidt, so rather than make errors worse in most places we instead |