From: Vadim Lebedev (vlebedev@aplio.fr)
Date: Fri Jan 19 2001 - 10:13:44 EST
Actually mm subdirectory is unused for ucLinux, take a look into the mmnommu
here resides the relevant code.
Vadim
|-----Original Message-----
|From: owner-uclinux-dev@uClinux.org
|[mailto:owner-uclinux-dev@uClinux.org]On Behalf Of Arne Jonsson
|Sent: vendredi 19 janvier 2001 14:19
|To: uclinux-dev@uClinux.org
|Subject: [uClinux-dev] uClinux for ARM to use?
|
|
|Hi!
|
|This is only for those knowing anything about uClinux for ARM.
|
|When comparing the stuff RedHat (Wirespeed) put together and the stuff
|that Aplio has
|made I feel totally lost!
|For example:
|mm/memory.c differs and it seems to me in an important way:
|
|snippet from the RedHat memory.c:
|int new_page_tables(struct task_struct * tsk)
|{
| pgd_t * page_dir, * new_pg;
|
| if (!(new_pg = pgd_alloc()))
| return -ENOMEM;
| page_dir = pgd_offset(&init_mm, 0);
| flush_cache_mm(tsk->mm);
| memcpy(new_pg + USER_PTRS_PER_PGD, page_dir + USER_PTRS_PER_PGD,
| (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof (pgd_t));
| flush_tlb_mm(tsk->mm);
| SET_PAGE_DIR(tsk, new_pg);
| tsk->mm->pgd = new_pg;
| return 0;
|}
|
|snippet from the Aplio memory.c
|int new_page_tables(struct task_struct * tsk)
|{
| pgd_t * page_dir, * new_pg;
|
| if (!(new_pg = pgd_alloc()))
| return -ENOMEM;
| page_dir = pgd_offset(&init_mm, 0);
| flush_cache_mm(tsk->mm);
| memcpy(new_pg + USER_PTRS_PER_PGD, page_dir + USER_PTRS_PER_PGD,
| (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof (pgd_t));
|#ifdef CONFIG_ARM
| /* on the ARM we need to leave the 1st page mapped in */
| copy_pmd_range (new_pg, page_dir, 0, PAGE_SIZE, 0);
|#endif
| flush_tlb_mm(tsk->mm);
| SET_PAGE_DIR(tsk, new_pg);
| update_mm_cache_task(tsk);
| tsk->mm->pgd = new_pg;
| return 0;
|}
|
|Is there a patch missing?
|Is the above ifdef not necessary in the code from aplio?
|The update_mm_cache call is also missing in the RedHat code, why?
|Please clarify I really appreciate this because I have to make a
|descision on what uClinux to start from RedHat or Aplio.
|
|I am also trying to build a big endian tool-chain for ARM7TDMI. I have
|read a lot of stuff but
|haven't succeded yet, does anyone have any ides/suggestions?
|
|Regards,
|
|/Arne Jonsson
|
|
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