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TODO revision 1.20.4.1 
      1 $NetBSD: TODO,v 1.20.4.1 2005/11/02 11:57:54 yamt Exp $
      2 
      3 To do list (in some particular order)
      4 XXX some entries might be obsolete.
      5 
      6     o	sysinst
      7 	maybe MD fdisk partitioning support is required to load files
      8 	from FAT partition on ARC BIOS prompt.
      9 
     10     o	install notes
     11 
     12 
     13     o	use MI driver
     14 
     15 	-   make fd driver MI, and share it with other ports
     16 	    (contact christos about MI fd driver)
     17 
     18 	-   use MI bha driver instead of home grown btl
     19 	    XXX needs fixes of DESKstation support
     20 
     21     o	VXL framebuffer support (Magnum, RISCstation 2200)
     22 
     23     o	com_jazzio.c
     24 	-   clock handling clean up (obtain from ARC BIOS)
     25 	-   fifo disabling may be only needed on some Magnum?
     26 
     27     o	remove pccons and switch to wscons completely
     28 	(XXX what's the problem to remove pccons?)
     29 
     30     o	AD1848 audio support
     31 
     32     o	missing MI devices
     33 		ses?, vcoda, ...
     34 
     35 
     36     o	Xserver
     37 
     38 	-   VXL		Magnum, RISCstation 2200
     39 	-   vga/S3	PICA, Image RISCstation - OpenBSD's?
     40 	-   vga/cirrus	RISCserver 2200, Express5800/240 R4400 EISA
     41 	-   vga/???	DESKstation Tyne, rPC44
     42 	-   TGA		RISCstation 2250, Express5800/230 R4400 PCI
     43 
     44     o   Find out why bitmap load to S3-928 flashes screen. (X server)
     45 	Know why (enable linear mode). Need S3 info.
     46 
     47 
     48     o	repair DESKstation support
     49 	-   requires bounce buffer bus_dma for Tyne
     50 		XXX - too small bounce buffer size (128KB)
     51 
     52     o	Olivetti M700 support
     53 
     54     o	NEC Express5800/230 R10000 PCI (NEC-J95) support
     55 	(needs MI R10000 support)
     56 
     57     o	SNI RM200PCI/RM300/RM400/RM600 support
     58 
     59 
     60     o	parse ARC BIOS configuration information and use it
     61 
     62     o	increase MAXPHYS to 64KB
     63 	(XXX why is it limited to 32KB?)
     64 
     65     o	fix kernel start address
     66 	(maybe requires bootloader support)
     67 
     68     o	allocate PICA_TL_BASE dynamically
     69 
     70     o	remove inb/outb
     71 
     72     o	remove UADDR
     73 
     74     o	fix mem_clusters[] usage.
     75 
     76     o	intrcnt[] name cleanup, use MI evcnt(9)
     77 
     78     o	test and merge soren's clean up about proc0.p_addr.
     79 
     80     o	redesign interrupt handler framework.
     81 	i/o bus devices should have sane IPL, but currently doesn't.
     82 
     83 	also, current MIPS interrupt handler has overblocking and
     84 	other problems as follows:
     85 
     86 	-   SR_INT_IE should be enabled before calling hardclock().
     87 	    Since this is not done currently, spllowersoftclock()
     88 	    on hardclock() doesn't have effect, and softclock() is
     89 	    handled with all interrupt disabled in this case.
     90 		-> overblocking, possibly causes missing hardclock()
     91 
     92 	-   MIPS3_CLKF_BASEPRI() doesn't work correctly,
     93 	    when MIPS_INT_MASK_5 (== MIPS_INT_MASK_CLOCK) is disabled.
     94 		-> micro optimization on hardclock() doesn't work.
     95 		   but currently this may make hardclock() latency better
     96 		   due to above SR_INT_IE problem.
     97 	    s/MIPS_INT_MASK/MIPS3_INT_MASK/ makes this work, although tricky.
     98 
     99 	-   if (ipending & INT_MASK_REAL_DEV) == 0,
    100 	    softnet() and softclock() are handled with all interrupt disabled.
    101 		-> overblocking, possibly causes missing hardclock()
    102 
    103 	-   `netisr' handling in netintr() implies potential race condition.
    104 	    The access to `netisr' should be protected by splnet().
    105 	    Currently this is not real problem due to above overblocking.
    106 
    107 	-   INT_MASK_REAL_DEV should be removed
    108 
    109 	-   make CLKF_INTR() work.
    110 
    111     o	it is better to always disable MIPS_INT_MASK_CLOCK.
    112 	those are the points which should be fixed:
    113 	mips_idle: li t0, (MIPS_INT_MASK | MIPS_SR_INT_IE)
    114 	machdep.c: curpcb->pcb_context[11] = MIPS_INT_MASK | MIPS_SR_INT_IE;
    115 	spl0()
    116 	splnone()
    117 
    118 	-   MIPS_INT_MASK_CLOCK should be removed in someway
    119 
    120     o	XXX at least 2000/06/07 version is already quite unstable
    121 	on PICA and NEC Image RISCstation. (but almost OK on Magnum)
    122 	Userland commands dumps	core randomly.
    123 	This version is before _MIPS_PADDR_T_64BIT changes
    124 	and MIPS3_TLB_WIRED_UPAGES changes.	
    125 
    126 	"vm_page_zero_enable = FALSE" makes this problem disappeared.
    127 	(vm_page_zero_enable = FALSE by default on all archs w/ UBC, now)
    128 
    129 	currently, page zero in the idle loop is also disabled on
    130 	untested platforms like DESKstation rPC44/Tyne and SNI for safety.
    131 
    132 	    XXX what's the current status of uvm_pageidlezero()?
    133 
    134 
    135     o	resolve "XXX"
    136 
    137 
    138 (following entries might be MI MIPS items)
    139 
    140     o	Move the RO and WIRED attribute from the pte to the pv table.
    141 	This saves four instructions in the tlb miss handler.
    142 
    143     o   Can we have 32 double registers?
    144 
    145     o	64bit kernel/userland
    146 
    147     o	omit __SWAP_BROKEN in <mips/types.h>
    148 
    149     o	clean up ALEAF/NLEAF/NON_LEAF/NNON_LEAF in userland.
    150 
    151 Lots of other things.....
    152