BMC/Intel-BMC/linux.git/arch/powerpc/kernel/head_fsl_booke.S, branch dev

powerpc/booke: Revert SPE/AltiVec common defines for interrupt numbers

2014-09-22T08:11:31+00:00

Book3E specification defines shared interrupt numbers for SPE and AltiVec units. Still SPE is present in e200/e500v2 cores while AltiVec is present in e6500 core. So we can currently decide at compile-time which unit to support exclusively. As Alexander Graf suggested, this will improve code readability especially in KVM. Use distinct defines to identify SPE/AltiVec interrupt numbers, reverting c58ce397 and 6b310fc5 patches that added common defines. Signed-off-by: Mihai Caraman Acked-by: Scott Wood Signed-off-by: Alexander Graf

powerpc/booke: Restrict SPE exception handlers to e200/e500 cores

2014-09-22T08:11:31+00:00

SPE exception handlers are now defined for 32-bit e500mc cores even though SPE unit is not present and CONFIG_SPE is undefined. Restrict SPE exception handlers to e200/e500 cores adding CONFIG_SPE_POSSIBLE and consequently guard __stup_ivors and __setup_cpu functions. Signed-off-by: Mihai Caraman Acked-by: Scott Wood Signed-off-by: Alexander Graf

powerpc/fsl_booke: smp support for booting a relocatable kernel above 64M

2014-01-09T23:52:18+00:00

When booting above the 64M for a secondary cpu, we also face the same issue as the boot cpu that the PAGE_OFFSET map two different physical address for the init tlb and the final map. So we have to use switch_to_as1/restore_to_as0 between the conversion of these two maps. When restoring to as0 for a secondary cpu, we only need to return to the caller. So add a new parameter for function restore_to_as0 for this purpose. Use LOAD_REG_ADDR_PIC to get the address of variables which may be used before we set the final map in cams for the secondary cpu. Move the setting of cams a bit earlier in order to avoid the unnecessary using of LOAD_REG_ADDR_PIC. Signed-off-by: Kevin Hao Signed-off-by: Scott Wood

powerpc/fsl_booke: make sure PAGE_OFFSET map to memstart_addr for relocatable kernel

2014-01-09T23:52:17+00:00

This is always true for a non-relocatable kernel. Otherwise the kernel would get stuck. But for a relocatable kernel, it seems a little complicated. When booting a relocatable kernel, we just align the kernel start addr to 64M and map the PAGE_OFFSET from there. The relocation will base on this virtual address. But if this address is not the same as the memstart_addr, we will have to change the map of PAGE_OFFSET to the real memstart_addr and do another relocation again. Signed-off-by: Kevin Hao [scottwood@freescale.com: make offset long and non-negative in simple case] Signed-off-by: Scott Wood

powerpc/fsl_booke: set the tlb entry for the kernel address in AS1

2014-01-09T23:52:16+00:00

We use the tlb1 entries to map low mem to the kernel space. In the current code, it assumes that the first tlb entry would cover the kernel image. But this is not true for some special cases, such as when we run a relocatable kernel above the 64M or set CONFIG_KERNEL_START above 64M. So we choose to switch to address space 1 before setting these tlb entries. Signed-off-by: Kevin Hao Signed-off-by: Scott Wood

powerpc: enable the relocatable support for the fsl booke 32bit kernel

2014-01-09T23:52:16+00:00

This is based on the codes in the head_44x.S. The difference is that the init tlb size we used is 64M. With this patch we can only load the kernel at address between memstart_addr ~ memstart_addr + 64M. We will fix this restriction in the following patches. Signed-off-by: Kevin Hao Signed-off-by: Scott Wood

powerpc/fsl_booke: introduce get_phys_addr function

2014-01-09T23:52:15+00:00

Move the codes which translate a effective address to physical address to a separate function. So it can be reused by other code. Signed-off-by: Kevin Hao Signed-off-by: Scott Wood

powerpc/fsl_booke: protect the access to MAS7

2014-01-09T23:52:14+00:00

The e500v1 doesn't implement the MAS7, so we should avoid to access this register on that implementations. In the current kernel, the access to MAS7 are protected by either CONFIG_PHYS_64BIT or MMU_FTR_BIG_PHYS. Since some code are executed before the code patching, we have to use CONFIG_PHYS_64BIT in these cases. Signed-off-by: Kevin Hao Signed-off-by: Scott Wood

powerpc/fsl-booke: Use common defines for SPE/FP interrupts numbers

2013-10-16T23:49:44+00:00

On Book3E some SPE/FP/AltiVec interrupts share the same number. Use common defines to indentify these numbers. Signed-off-by: Mihai Caraman [scottwood@freescale.com: fixed space-before-tab] Signed-off-by: Scott Wood

powerpc: Remove the empty giveup_fpu() function on 32bit kernel

2013-08-14T04:59:50+00:00

Instead of implementing an empty giveup_fpu() function for each 32bit processor type, replace them with an unique empty inline function. Signed-off-by: Kevin Hao Signed-off-by: Benjamin Herrenschmidt