[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 3/6] xen: factor out allocation of page tables into separate function
Do the allocation of page tables in a separate function. This will allow to do the allocation at different times of the boot preparations depending on the features the kernel is supporting. Signed-off-by: Juergen Gross <jgross@xxxxxxxx> --- grub-core/loader/i386/xen.c | 82 ++++++++++++++++++++++++++++----------------- 1 file changed, 51 insertions(+), 31 deletions(-) diff --git a/grub-core/loader/i386/xen.c b/grub-core/loader/i386/xen.c index e48cc3f..65cec27 100644 --- a/grub-core/loader/i386/xen.c +++ b/grub-core/loader/i386/xen.c @@ -56,6 +56,9 @@ static struct grub_relocator_xen_state state; static grub_xen_mfn_t *virt_mfn_list; static struct start_info *virt_start_info; static grub_xen_mfn_t console_pfn; +static grub_uint64_t *virt_pgtable; +static grub_uint64_t pgtbl_start; +static grub_uint64_t pgtbl_end; #define PAGE_SIZE 4096 #define MAX_MODULES (PAGE_SIZE / sizeof (struct xen_multiboot_mod_list)) @@ -106,17 +109,17 @@ get_pgtable_size (grub_uint64_t total_pages, grub_uint64_t virt_base) static void generate_page_table (grub_uint64_t *where, grub_uint64_t paging_start, - grub_uint64_t total_pages, grub_uint64_t virt_base, - grub_xen_mfn_t *mfn_list) + grub_uint64_t paging_end, grub_uint64_t total_pages, + grub_uint64_t virt_base, grub_xen_mfn_t *mfn_list) { if (!virt_base) - total_pages++; + paging_end++; grub_uint64_t lx[NUMBER_OF_LEVELS], lxs[NUMBER_OF_LEVELS]; grub_uint64_t nlx, nls, sz = 0; int l; - nlx = total_pages; + nlx = paging_end; nls = virt_base >> PAGE_SHIFT; for (l = 0; l < NUMBER_OF_LEVELS; l++) { @@ -160,7 +163,7 @@ generate_page_table (grub_uint64_t *where, grub_uint64_t paging_start, if (pr) pg += POINTERS_PER_PAGE; - for (j = 0; j < total_pages; j++) + for (j = 0; j < paging_end; j++) { if (j >= paging_start && j < lp) pg[j + lxs[0]] = page2offset (mfn_list[j]) | 5; @@ -261,24 +264,12 @@ grub_xen_special_alloc (void) } static grub_err_t -grub_xen_boot (void) +grub_xen_pt_alloc (void) { grub_relocator_chunk_t ch; grub_err_t err; grub_uint64_t nr_info_pages; grub_uint64_t nr_pages, nr_pt_pages, nr_need_pages; - struct gnttab_set_version gnttab_setver; - grub_size_t i; - - if (grub_xen_n_allocated_shared_pages) - return grub_error (GRUB_ERR_BUG, "active grants"); - - err = grub_xen_p2m_alloc (); - if (err) - return err; - err = grub_xen_special_alloc (); - if (err) - return err; next_start.pt_base = max_addr + xen_inf.virt_base; state.paging_start = max_addr >> PAGE_SHIFT; @@ -298,30 +289,59 @@ grub_xen_boot (void) nr_pages = nr_need_pages; } - grub_dprintf ("xen", "bootstrap domain %llx+%llx\n", - (unsigned long long) xen_inf.virt_base, - (unsigned long long) page2offset (nr_pages)); - err = grub_relocator_alloc_chunk_addr (relocator, &ch, max_addr, page2offset (nr_pt_pages)); if (err) return err; + virt_pgtable = get_virtual_current_address (ch); + pgtbl_start = max_addr >> PAGE_SHIFT; + max_addr += page2offset (nr_pt_pages); + state.stack = max_addr + STACK_SIZE + xen_inf.virt_base; + state.paging_size = nr_pt_pages; + next_start.nr_pt_frames = nr_pt_pages; + max_addr = page2offset (nr_pages); + pgtbl_end = nr_pages; + + return GRUB_ERR_NONE; +} + +static grub_err_t +grub_xen_boot (void) +{ + grub_err_t err; + grub_uint64_t nr_pages; + struct gnttab_set_version gnttab_setver; + grub_size_t i; + + if (grub_xen_n_allocated_shared_pages) + return grub_error (GRUB_ERR_BUG, "active grants"); + + err = grub_xen_p2m_alloc (); + if (err) + return err; + err = grub_xen_special_alloc (); + if (err) + return err; + err = grub_xen_pt_alloc (); + if (err) + return err; + err = set_mfns (console_pfn); if (err) return err; - generate_page_table (get_virtual_current_address (ch), - max_addr >> PAGE_SHIFT, nr_pages, + nr_pages = max_addr >> PAGE_SHIFT; + + grub_dprintf ("xen", "bootstrap domain %llx+%llx\n", + (unsigned long long) xen_inf.virt_base, + (unsigned long long) page2offset (nr_pages)); + + generate_page_table (virt_pgtable, pgtbl_start, pgtbl_end, nr_pages, xen_inf.virt_base, virt_mfn_list); - max_addr += page2offset (nr_pt_pages); - state.stack = max_addr + STACK_SIZE + xen_inf.virt_base; state.entry_point = xen_inf.entry_point; - next_start.nr_pt_frames = nr_pt_pages; - state.paging_size = nr_pt_pages; - *virt_start_info = next_start; grub_memset (&gnttab_setver, 0, sizeof (gnttab_setver)); @@ -335,8 +355,8 @@ grub_xen_boot (void) return grub_relocator_xen_boot (relocator, state, nr_pages, xen_inf.virt_base < PAGE_SIZE ? page2offset (nr_pages) : 0, - nr_pages - 1, - page2offset (nr_pages - 1) + + pgtbl_end - 1, + page2offset (pgtbl_end - 1) + xen_inf.virt_base); } -- 2.1.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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