Clarify build generated "zone low" values.

Rename datalow_base (and similar) to zonelow_base, and datalow_start
(and similar) to varlow_start.  This helps distinguish between the
bounds for the runtime dynamic memory pool and the compile time global
variables.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

6 files changed, 36 insertions, 36 deletions

diff --git a/src/biosvar.h b/src/biosvar.h
index f0a0fd2..520fc3e 100644
--- a/src/biosvar.h
+++ b/src/biosvar.h
@@ -251,13 +251,13 @@ static inline u16 get_global_seg(void) {
  * "Low" memory variables
  ****************************************************************/
 
-extern u8 _datalow_seg, datalow_base[];
-#define SEG_LOW ((u32)&_datalow_seg)
+extern u8 _zonelow_seg, zonelow_base[];
+#define SEG_LOW ((u32)&_zonelow_seg)
 
 #if MODESEGMENT
 #define GET_LOW(var)            GET_FARVAR(SEG_LOW, (var))
 #define SET_LOW(var, val)       SET_FARVAR(SEG_LOW, (var), (val))
-#define LOWFLAT2LOW(var) ((typeof(var))((void*)(var) - (u32)datalow_base))
+#define LOWFLAT2LOW(var) ((typeof(var))((void*)(var) - (u32)zonelow_base))
 #else
 #define GET_LOW(var)            (var)
 #define SET_LOW(var, val)       do { (var) = (val); } while (0)
diff --git a/src/pmm.c b/src/pmm.c
index d1986c2..790177e 100644
--- a/src/pmm.c
+++ b/src/pmm.c
@@ -192,8 +192,8 @@ rom_reserve(u32 size)
     u32 newend = ALIGN(RomEnd + size, OPTION_ROM_ALIGN) + OPROM_HEADER_RESERVE;
     if (newend > (u32)RomBase->allocend)
         return NULL;
-    if (newend < (u32)datalow_base + OPROM_HEADER_RESERVE)
-        newend = (u32)datalow_base + OPROM_HEADER_RESERVE;
+    if (newend < (u32)zonelow_base + OPROM_HEADER_RESERVE)
+        newend = (u32)zonelow_base + OPROM_HEADER_RESERVE;
     RomBase->data = RomBase->dataend = (void*)newend;
     return (void*)RomEnd;
 }
@@ -254,8 +254,8 @@ malloc_preinit(void)
     // Populate other regions
     addSpace(&ZoneTmpLow, (void*)BUILD_STACK_ADDR, (void*)BUILD_EBDA_MINIMUM);
     addSpace(&ZoneFSeg, BiosTableSpace, &BiosTableSpace[CONFIG_MAX_BIOSTABLE]);
-    extern u8 final_datalow_start[];
-    addSpace(&ZoneLow, datalow_base + OPROM_HEADER_RESERVE, final_datalow_start);
+    extern u8 final_varlow_start[];
+    addSpace(&ZoneLow, zonelow_base + OPROM_HEADER_RESERVE, final_varlow_start);
     RomBase = findLast(&ZoneLow);
     if (highram) {
         addSpace(&ZoneHigh, (void*)highram
@@ -278,8 +278,8 @@ csm_malloc_preinit(u32 low_pmm, u32 low_pmm_size, u32 hi_pmm, u32 hi_pmm_size)
     }
     addSpace(&ZoneTmpLow, (void *)low_pmm, (void *)low_pmm + low_pmm_size);
     addSpace(&ZoneFSeg, BiosTableSpace, &BiosTableSpace[CONFIG_MAX_BIOSTABLE]);
-    extern u8 final_datalow_start[];
-    addSpace(&ZoneLow, datalow_base + OPROM_HEADER_RESERVE, final_datalow_start);
+    extern u8 final_varlow_start[];
+    addSpace(&ZoneLow, zonelow_base + OPROM_HEADER_RESERVE, final_varlow_start);
     RomBase = findLast(&ZoneLow);
 }
 
@@ -300,8 +300,8 @@ malloc_fixupreloc_init(void)
     }
 
     // Move low-memory initial variable content to new location.
-    extern u8 datalow_start[], datalow_end[], final_datalow_start[];
-    memmove(final_datalow_start, datalow_start, datalow_end - datalow_start);
+    extern u8 varlow_start[], varlow_end[], final_varlow_start[];
+    memmove(final_varlow_start, varlow_start, varlow_end - varlow_start);
 
     // Add space free'd during relocation in f-segment to ZoneFSeg
     extern u8 code32init_end[];
diff --git a/src/post.c b/src/post.c
index f2eded9..cf0d9b4 100644
--- a/src/post.c
+++ b/src/post.c
@@ -98,7 +98,7 @@ bda_init(void)
              , E820_RESERVED);
 
     // Init extra stack
-    StackPos = (void*)(&ExtraStack[BUILD_EXTRA_STACK_SIZE] - datalow_base);
+    StackPos = (void*)(&ExtraStack[BUILD_EXTRA_STACK_SIZE] - zonelow_base);
 }
 
 void
@@ -264,8 +264,8 @@ reloc_preinit(void *f, void *arg)
     extern u32 _reloc_rel_start[], _reloc_rel_end[];
     extern u32 _reloc_init_start[], _reloc_init_end[];
     extern u8 code32init_start[], code32init_end[];
-    extern u32 _reloc_datalow_start[], _reloc_datalow_end[];
-    extern u8 datalow_start[], datalow_end[], final_datalow_start[];
+    extern u32 _reloc_varlow_start[], _reloc_varlow_end[];
+    extern u8 varlow_start[], varlow_end[], final_varlow_start[];
 
     // Allocate space for init code.
     u32 initsize = code32init_end - code32init_start;
@@ -276,9 +276,9 @@ reloc_preinit(void *f, void *arg)
 
     // Copy code and update relocs (init absolute, init relative, and runtime)
     dprintf(1, "Relocating low data from %p to %p (size %d)\n"
-            , datalow_start, final_datalow_start, datalow_end - datalow_start);
-    updateRelocs(code32flat_start, _reloc_datalow_start, _reloc_datalow_end
-                 , final_datalow_start - datalow_start);
+            , varlow_start, final_varlow_start, varlow_end - varlow_start);
+    updateRelocs(code32flat_start, _reloc_varlow_start, _reloc_varlow_end
+                 , final_varlow_start - varlow_start);
     dprintf(1, "Relocating init from %p to %p (size %d)\n"
             , code32init_start, codedest, initsize);
     s32 delta = codedest - (void*)code32init_start;
diff --git a/src/romlayout.S b/src/romlayout.S
index 2a2984c..7fdd8fa 100644
--- a/src/romlayout.S
+++ b/src/romlayout.S
@@ -241,7 +241,7 @@ entry_resume:
         cli
         cld
         // Use the ExtraStack in low mem.
-        movl $_datalow_seg, %eax
+        movl $_zonelow_seg, %eax
         movw %ax, %ds
         movw %ax, %ss
         movl $ExtraStack + BUILD_EXTRA_STACK_SIZE, %esp
@@ -443,7 +443,7 @@ irqentry_extrastack:
         cld
         pushw %ds               // Set %ds:%eax to space on ExtraStack
         pushl %eax
-        movl $_datalow_seg, %eax
+        movl $_zonelow_seg, %eax
         movl %eax, %ds
         movl StackPos, %eax
         subl $24, %eax
diff --git a/src/types.h b/src/types.h
index 24b078e..52b5280 100644
--- a/src/types.h
+++ b/src/types.h
@@ -99,7 +99,7 @@ extern void __force_link_error__only_in_16bit(void) __noreturn;
 # define VAR16FIXED(addr) VAR16VISIBLE
 # define VAR32SEG __section(".discard.var32seg." UNIQSEC)
 # define VAR32FLATVISIBLE __section(".data.runtime." UNIQSEC) __VISIBLE
-# define VARLOW __section(".datalow." UNIQSEC) __VISIBLE
+# define VARLOW __section(".data.varlow." UNIQSEC) __VISIBLE
 # define ASM16(code)
 # define ASM32FLAT(code) __ASM(code)
 # define ASSERT16() __force_link_error__only_in_16bit()
diff --git a/tools/layoutrom.py b/tools/layoutrom.py
index ad0386a..ac339e8 100755
--- a/tools/layoutrom.py
+++ b/tools/layoutrom.py
@@ -157,7 +157,7 @@ class LayoutInfo:
     sections32flat = sec32flat_start = sec32flat_align = None
     sections32init = sec32init_start = sec32init_align = None
     sections32low = sec32low_start = sec32low_align = None
-    datalow_base = final_sec32low_start = None
+    zonelow_base = final_sec32low_start = None
 
 # Determine final memory addresses for sections
 def doLayout(sections, genreloc):
@@ -222,11 +222,11 @@ def doLayout(sections, genreloc):
         sec32low_top = min(BUILD_BIOS_ADDR, li.sec32init_start)
         final_sec32low_top = sec32low_top
     relocdelta = final_sec32low_top - sec32low_top
-    datalow_base = final_sec32low_top - 64*1024
-    li.datalow_base = max(BUILD_ROM_START, alignpos(datalow_base, 2*1024))
+    zonelow_base = final_sec32low_top - 64*1024
+    li.zonelow_base = max(BUILD_ROM_START, alignpos(zonelow_base, 2*1024))
     li.sec32low_start, li.sec32low_align = setSectionsStart(
         li.sections32low, sec32low_top, 16
-        , segoffset=li.datalow_base - relocdelta)
+        , segoffset=li.zonelow_base - relocdelta)
     li.final_sec32low_start = li.sec32low_start + relocdelta
 
     # Print statistics
@@ -312,15 +312,15 @@ def getSectionsStart(sections, defaddr=0):
 def writeLinkerScripts(li, exportsyms, genreloc, out16, out32seg, out32flat):
     # Write 16bit linker script
     out = outXRefs(li.sections16, useseg=1) + """
-    datalow_base = 0x%x ;
-    _datalow_seg = 0x%x ;
+    zonelow_base = 0x%x ;
+    _zonelow_seg = 0x%x ;
 
     code16_start = 0x%x ;
     .text16 code16_start : {
 %s
     }
-""" % (li.datalow_base,
-       li.datalow_base / 16,
+""" % (li.zonelow_base,
+       li.zonelow_base / 16,
        li.sec16_start - BUILD_BIOS_ADDR,
        outRelSections(li.sections16, 'code16_start', useseg=1))
     outfile = open(out16, 'wb')
@@ -356,20 +356,20 @@ def writeLinkerScripts(li, exportsyms, genreloc, out16, out32seg, out32flat):
         relocstr = (strRelocs("_reloc_abs", "code32init_start", absrelocs)
                     + strRelocs("_reloc_rel", "code32init_start", relrelocs)
                     + strRelocs("_reloc_init", "code32flat_start", initrelocs)
-                    + strRelocs("_reloc_datalow", "code32flat_start", lowrelocs))
+                    + strRelocs("_reloc_varlow", "code32flat_start", lowrelocs))
         numrelocs = len(absrelocs + relrelocs + initrelocs + lowrelocs)
         sec32all_start -= numrelocs * 4
     out = outXRefs(sections32all, exportsyms=exportsyms) + """
     _reloc_min_align = 0x%x ;
-    datalow_base = 0x%x ;
-    final_datalow_start = 0x%x ;
+    zonelow_base = 0x%x ;
+    final_varlow_start = 0x%x ;
 
     code32flat_start = 0x%x ;
     .text code32flat_start : {
 %s
-        datalow_start = ABSOLUTE(.) ;
+        varlow_start = ABSOLUTE(.) ;
 %s
-        datalow_end = ABSOLUTE(.) ;
+        varlow_end = ABSOLUTE(.) ;
         code32init_start = ABSOLUTE(.) ;
 %s
         code32init_end = ABSOLUTE(.) ;
@@ -381,7 +381,7 @@ def writeLinkerScripts(li, exportsyms, genreloc, out16, out32seg, out32flat):
         code32flat_end = ABSOLUTE(.) ;
     } :text
 """ % (li.sec32init_align,
-       li.datalow_base,
+       li.zonelow_base,
        li.final_sec32low_start,
        sec32all_start,
        relocstr,
@@ -418,7 +418,7 @@ def markRuntime(section, sections):
 def findInit(sections):
     # Recursively find and mark all "runtime" sections.
     for section in sections:
-        if ('.datalow.' in section.name or '.runtime.' in section.name
+        if ('.data.varlow.' in section.name or '.runtime.' in section.name
             or '.export.' in section.name):
             markRuntime(section, sections)
     for section in sections:
@@ -611,7 +611,7 @@ def main():
     findInit(sections)
 
     # Note "low memory" parts
-    for section in getSectionsPrefix(sections, '.datalow.'):
+    for section in getSectionsPrefix(sections, '.data.varlow.'):
         section.category = '32low'
 
     # Determine the final memory locations of each kept section.