diff options
| author | Michael Brown | 2006-05-04 19:00:20 +0200 |
|---|---|---|
| committer | Michael Brown | 2006-05-04 19:00:20 +0200 |
| commit | f4429533a6d2174e5f5e7674159090a63032be1a (patch) | |
| tree | 76baf4d689ee0dbbe040598df18ccee92a7a9dd0 /src/arch/i386/include/librm.h | |
| parent | BSS is now zeroed by libprefix (along with the otherwise non-zeroable (diff) | |
| download | ipxe-f4429533a6d2174e5f5e7674159090a63032be1a.tar.gz ipxe-f4429533a6d2174e5f5e7674159090a63032be1a.tar.xz ipxe-f4429533a6d2174e5f5e7674159090a63032be1a.zip | |
Added methods for efficiently declaring and accessing variables in
.data16. librm will need to supply "char *data16", i.e. the virtual
address of the start of .data16.
Diffstat (limited to 'src/arch/i386/include/librm.h')
| -rw-r--r-- | src/arch/i386/include/librm.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/arch/i386/include/librm.h b/src/arch/i386/include/librm.h index 76ef8d62..b4970c02 100644 --- a/src/arch/i386/include/librm.h +++ b/src/arch/i386/include/librm.h @@ -15,6 +15,17 @@ * */ +/* Access to variables in .data16 */ +extern char *data16; + +#define __data16( variable ) \ + _data16_ ## variable __asm__ ( #variable ) \ + __attribute__ (( section ( ".data16" ) )) + +#define __use_data16( variable ) \ + ( * ( ( typeof ( _data16_ ## variable ) * ) \ + & ( data16 [ ( size_t ) & ( _data16_ ## variable ) ] ) ) ) + /* Variables in librm.S, present in the normal data segment */ extern uint16_t rm_sp; extern uint16_t rm_ss; |