gdrom: add gdrom register definitions

common.mk

@@ -161,6 +161,12 @@ sh7091/sh7091.hpp: regs/sh7091.csv regs/gen/sh7091.py
 sh7091/sh7091_bits.hpp: regs/sh7091_bits.csv regs/gen/core_bits.py
 	python regs/gen/core_bits.py $< > $@
 
+systembus.hpp: regs/systembus.csv regs/gen/systembus.py
+	python regs/gen/systembus.py $< > $@
+
+gdrom.hpp: regs/gdrom.csv regs/gen/gdrom.py
+	python regs/gen/gdrom.py $< > $@
+
 clean:
 	find -P \
 		-regextype posix-egrep \

gdrom.hpp

@@ -0,0 +1,53 @@
+#include <cstdint>
+#include <cstddef>
+
+#include "type.hpp"
+
+struct gdrom_if_reg {
+  const reg8  _pad0[24];
+  union {
+    const reg8  alternate_status;
+    reg8  device_control;
+  };
+  const reg8  _pad1[103];
+  reg16 data;
+  const reg8  _pad2[2];
+  union {
+    const reg8  error;
+    reg8  features;
+  };
+  const reg8  _pad3[3];
+  union {
+    const reg8  interrupt_reason;
+    reg8  sector_count;
+  };
+  const reg8  _pad4[3];
+  reg8  sector_number;
+  const reg8  _pad5[3];
+  reg8  byte_control_low;
+  const reg8  _pad6[3];
+  reg8  byte_control_high;
+  const reg8  _pad7[3];
+  reg8  drive_select;
+  const reg8  _pad8[3];
+  union {
+    const reg8  status;
+    reg8  command;
+  };
+};
+
+static_assert((offsetof (struct gdrom_if_reg, alternate_status)) == 24);
+static_assert((offsetof (struct gdrom_if_reg, device_control)) == 24);
+static_assert((offsetof (struct gdrom_if_reg, data)) == 128);
+static_assert((offsetof (struct gdrom_if_reg, error)) == 132);
+static_assert((offsetof (struct gdrom_if_reg, features)) == 132);
+static_assert((offsetof (struct gdrom_if_reg, interrupt_reason)) == 136);
+static_assert((offsetof (struct gdrom_if_reg, sector_count)) == 136);
+static_assert((offsetof (struct gdrom_if_reg, sector_number)) == 140);
+static_assert((offsetof (struct gdrom_if_reg, byte_control_low)) == 144);
+static_assert((offsetof (struct gdrom_if_reg, byte_control_high)) == 148);
+static_assert((offsetof (struct gdrom_if_reg, drive_select)) == 152);
+static_assert((offsetof (struct gdrom_if_reg, status)) == 156);
+static_assert((offsetof (struct gdrom_if_reg, command)) == 156);
+
+extern struct gdrom_if_reg gdrom_if __asm("gdrom_if");

regs/gdrom.csv

@@ -0,0 +1,14 @@
+"address","size","name","r/w","description"
+"0018","1","alternate_status","R",
+"0018","1","device_control","W",
+"0080","2","data","RW",
+"0084","1","error","R",
+"0084","1","features","W",
+"0088","1","interrupt_reason","R",
+"0088","1","sector_count","W",
+"008C","1","sector_number","RW",
+"0090","1","byte_control_low","RW",
+"0094","1","byte_control_high","RW",
+"0098","1","drive_select","RW",
+"009C","1","status","R",
+"009C","1","command","W",

regs/gen/gdrom.py

@@ -0,0 +1,85 @@
+from collections import defaultdict
+from dataclasses import dataclass
+import sys
+
+from sh7091 import read_input, size_to_type, headers
+from generate import renderer
+
+@dataclass
+class Register:
+    address: int
+    name: str
+    size: int
+    rw: set[str]
+
+def group_by_address(rows):
+    _rw = defaultdict(set)
+    _size = dict()
+    _groups = defaultdict(list)
+
+    def process_row(row):
+        address = int(row["address"], 16)
+        name = row["name"]
+        size = int(row["size"], 10)
+        rw = set(row["r/w"].upper())
+
+        if address not in _size:
+            _size[address] = size
+        assert _size[address] == size, row
+        assert _rw[address].intersection(rw) == set(), row
+        _groups[address].append(Register(
+            address=address,
+            name=name,
+            size=size,
+            rw=rw
+        ))
+
+    _ = list(map(process_row, rows))
+
+    return list(sorted(_groups.items(), key=lambda kv: kv[0]))
+
+def render_groups(groups):
+    next_address = 0
+    reserved_num = 0
+
+    yield "struct gdrom_if_reg {"
+
+    for address, group in groups:
+        assert address >= next_address
+        if address > next_address:
+            padding = address - next_address
+            type = size_to_type(1)
+            yield f"const {type} _pad{reserved_num}[{padding}];"
+            reserved_num += 1
+
+        if len(group) > 1:
+            yield "union {"
+
+        for reg in group:
+            type = size_to_type(reg.size)
+            const = "const " if reg.rw == {'R'} else ""
+            yield f"{const}{type} {reg.name};"
+
+        if len(group) > 1:
+            yield "};" # end of union
+
+        next_address = address + group[0].size
+
+    yield "};"
+
+
+    for address, group in groups:
+        for reg in group:
+            yield f"static_assert((offsetof (struct gdrom_if_reg, {reg.name})) == {reg.address});"
+
+    yield ""
+    yield 'extern struct gdrom_if_reg gdrom_if __asm("gdrom_if");'
+
+if __name__ == "__main__":
+    input_file = sys.argv[1]
+    rows = read_input(input_file)
+    groups = group_by_address(rows)
+    render, out = renderer()
+    render(headers())
+    render(render_groups(groups))
+    sys.stdout.write(out.getvalue())

regs/gen/sh7091.py

@@ -37,7 +37,7 @@ def size_to_type(size):
 
 def new_writer():
     first_address = 0
-    last_address = 0
+    next_address = 0
     last_block = None
     size_total = 0
     reserved_num = 0
@@ -56,7 +56,7 @@ def new_writer():
 
     def process_row(row):
         nonlocal first_address
-        nonlocal last_address
+        nonlocal next_address
         nonlocal last_block
         nonlocal reserved_num
         nonlocal size_total
@@ -76,14 +76,14 @@ def new_writer():
         if block != last_block:
             yield from terminate()
             first_address = offset_address
-            last_address = offset_address
+            next_address = offset_address
             size_total = 0
             reserved_num = 0
             yield f"struct {block.lower()}_reg {{"
 
-        if address != last_address:
-            padding = address - last_address
-            assert padding > 0, (row, address, last_address)
+        assert address >= next_address, row
+        if address > next_address:
+            padding = address - next_address
             type = size_to_type(1)
             yield f"{type} _pad{reserved_num}[{padding}];"
             reserved_num += 1
@@ -101,7 +101,7 @@ def new_writer():
         yield field().ljust(27) + f"/* {description} */"
 
         stack.append((address, name))
-        last_address = address + size
+        next_address = address + size
         last_block = block
         size_total += size