1. 23 3月, 2012 2 次提交
    • M
      microblaze: Handle TLB skip size dynamically · e02db0aa
      Michal Simek 提交于
      This patch fix the problem with rootfs on JFFS2 with early printk
      console turned on.
      
      The origin version used TLB63 for temporary early printk mapping.
      The code expect that kernel is not able to use all 64 TLB entries
      till early printk console is remapped by ioremap. After that
      temporary mapping on TLB63 is silently lost.
      This expectation give the opportunity to have early console pretty
      early.
      
      Microblaze systems with JFFS2 rootfs with early printk console turned on
      used more than 64 TLB entries before kernel can remap early console.
      Based on that kernel does access to bad area because early printk mapping
      is rewritten.
      
      This patch introduces tlb_skip variable which dynamically stores number
      of skipped TLB entries from the TLB0. skip_tlb=2 means that TLB0 and TLB1
      should be skipped.
      
      MICROBLAZE_TLB_SKIP defines how many TLB is skipped at the kernel start.
      They can be used for user purpose.
      
      TLB 63 is used for temporary LMB mapping (MICROBLAZE_LMB_TLB_ID).
      
      Also clean TLBLO when kernel starts.
      
      For specific kernel sizes kernel can use just one TLB. Detect this case
      and use the second TLB for general purpose.
      
      Change _tlbia function to flush TLB entries from tlb_skip to TLB_SIZE.
      
      Export tlb_skip size through debugfs.
      Signed-off-by: NMichal Simek <monstr@monstr.eu>
      e02db0aa
    • M
      microblaze: Introduce TLB skip size · 1451d1d8
      Michal Simek 提交于
      TLB skip size direct how many TLBs is skipped.
      Currently TLB0 and TLB1 are used for Linux kernel mapping
      that's why their are skipped.
      Signed-off-by: NMichal Simek <monstr@monstr.eu>
      1451d1d8
  2. 06 7月, 2009 1 次提交
  3. 26 5月, 2009 1 次提交
  4. 27 3月, 2009 1 次提交