diff options
| author | Stas Sergeev <stsp@aknet.ru> | 2004-06-26 20:53:48 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2004-06-26 20:53:48 -0700 |
| commit | cfe7f4f680859b89e86571d95c6d5a0ccb63a51c (patch) | |
| tree | c9bab7dd9f8adb03394ab0eec9ac7d92cb00c830 /include | |
| parent | e2dcfb355e776f2bd2bd64b3e04cd1dd8d668aa9 (diff) | |
[PATCH] larger IO bitmaps
The previous discussion was started here:
http://www.uwsg.iu.edu/hypermail/linux/kernel/0211.0/0477.html but in 2.4
times this was kind of problematic.
Now, with the lazy bitmap allocation and per-CPU TSS, this will really not
drain any resources I think. 8K TSS increase and 8K per process *that does
ioperm()* - I think it is not very bad.
The reasons why I need that, are described in the URL above. Basically this
will allow to use full-screen VESA under dosemu (without LFB though), and this
may be also helpfull for the XFree project and some other projects:
http://www.uwsg.iu.edu/hypermail/linux/kernel/9807.1/1079.html
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-i386/desc.h | 3 | ||||
| -rw-r--r-- | include/asm-i386/processor.h | 6 | ||||
| -rw-r--r-- | include/asm-mips/processor.h | 4 | ||||
| -rw-r--r-- | include/asm-x86_64/processor.h | 4 |
4 files changed, 9 insertions, 8 deletions
diff --git a/include/asm-i386/desc.h b/include/asm-i386/desc.h index 9361aff2e25c..5d126f73307e 100644 --- a/include/asm-i386/desc.h +++ b/include/asm-i386/desc.h @@ -44,7 +44,8 @@ __asm__ __volatile__ ("movw %w3,0(%2)\n\t" \ static inline void __set_tss_desc(unsigned int cpu, unsigned int entry, void *addr) { - _set_tssldt_desc(&cpu_gdt_table[cpu][entry], (int)addr, 235, 0x89); + _set_tssldt_desc(&cpu_gdt_table[cpu][entry], (int)addr, + offsetof(struct tss_struct, __cacheline_filler) - 1, 0x89); } #define set_tss_desc(cpu,addr) __set_tss_desc(cpu, GDT_ENTRY_TSS, addr) diff --git a/include/asm-i386/processor.h b/include/asm-i386/processor.h index 3acab65fc8e8..6fcdb7d1d493 100644 --- a/include/asm-i386/processor.h +++ b/include/asm-i386/processor.h @@ -297,9 +297,9 @@ extern unsigned int mca_pentium_flag; #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3)) /* - * Size of io_bitmap, covering ports 0 to 0x3ff. + * Size of io_bitmap. */ -#define IO_BITMAP_BITS 1024 +#define IO_BITMAP_BITS 65536 #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8) #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long)) #define IO_BITMAP_OFFSET offsetof(struct tss_struct,io_bitmap) @@ -391,7 +391,7 @@ struct tss_struct { /* * pads the TSS to be cacheline-aligned (size is 0x100) */ - unsigned long __cacheline_filler[5]; + unsigned long __cacheline_filler[37]; /* * .. and then another 0x100 bytes for emergency kernel stack */ diff --git a/include/asm-mips/processor.h b/include/asm-mips/processor.h index 8e38389a9915..a502e8360230 100644 --- a/include/asm-mips/processor.h +++ b/include/asm-mips/processor.h @@ -137,9 +137,9 @@ extern unsigned int vced_count, vcei_count; #endif /* - * Size of io_bitmap in longwords: 32 is ports 0-0x3ff. + * Size of io_bitmap in longwords. */ -#define IO_BITMAP_SIZE 32 +#define IO_BITMAP_SIZE 2048 #define NUM_FPU_REGS 32 diff --git a/include/asm-x86_64/processor.h b/include/asm-x86_64/processor.h index ec696b271ddf..934828c8269c 100644 --- a/include/asm-x86_64/processor.h +++ b/include/asm-x86_64/processor.h @@ -178,9 +178,9 @@ static inline void clear_in_cr4 (unsigned long mask) (test_thread_flag(TIF_IA32) ? TASK_UNMAPPED_32 : TASK_UNMAPPED_64) /* - * Size of io_bitmap, covering ports 0 to 0x3ff. + * Size of io_bitmap. */ -#define IO_BITMAP_BITS 1024 +#define IO_BITMAP_BITS 65536 #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8) #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long)) #define IO_BITMAP_OFFSET offsetof(struct tss_struct,io_bitmap) |